Fixes or workarounds for recent issues in classic Outlook for Windows

Last updated: September 2026

For issues that are not covered on this page, we have multiple tools to help you automatically diagnose and fix a range of classic Outlook problems. Check out this article: Resolve Outlook for Windows issues with automated troubleshooting tools.  

Outlook Known issues in September 2026 updates

• [FIXED] How to revert the Outlook Desktop WebView based Room Finder to the legacy Room Finder

• [INVESTIGATING] Voicemail audio attachments might not be visible in classic Outlook

• [INVESTIGATING] Copilot buttons are missing in classic Outlook for Windows

• [WORKAROUND] Public Holiday Calendars Missing Dates After June 2026 in Outlook

Outlook Known issues in August 2026 updates

• [FIXED] Copilot Chat shows three dots in classic Outlook for Windows

• [FIXED] Error when opening encrypted email in classic Outlook for Windows

Outlook Known issues in July 2026 updates

• [INVESTIGATING] Classic Outlook for Windows might crash when accepting a Shared Calendar invite

• [FIXED] Policy Tips are not displayed for message bodies or attachments in classic Outlook

• [DESIGN CHANGE] How to use Outlook Support and Recovery Assistant diagnostics in Windows Get Help

Outlook Known issues in June 2026 updates

• [INVESTIGATING] Outlook crashes unexpectedly when using Kaspersky antivirus

• [FIXED] Mailbox folders are not syncing with 0x80004005 error

• [INVESTIGATING] In AutoComplete, the "X" to remove individual suggested recipients might not work as expected

• [FIXED] Images are not displayed in emails, newsletters, or signatures in classic Outlook

Outlook Known issues in May 2026 updates

• [FIXED] Copilot Draft fails in classic Outlook with error "Sorry, something went wrong. Copilot is working on it."
• [FIXED] Quick Steps are grayed out in classic Outlook when they contain actions that can’t be fulfilled
• [FIXED] Office document links opened in classic Outlook might appear to be blank or open with an error
• [FIXED] Outlook 2024 LTSC crashes opening Viva Engage, Yammer, Power Automate, and other emails

Outlook Known issues in April 2026 updates

• [FIXED] Auto Translate stopped working in classic Outlook
• [FIXED] Outlook on premise Exchange web add-ins stopped loading after updating to Version 2603
• [FIXED] My Templates are missing from Outlook
• [FIXED] Classic Outlook error when sending from Outlook.com "You do not have permission to send on behalf of the specified user 0x80070005-0x0004dc-0x000524."

Outlook Known issues in March 2026 updates

• [FIXED] Classic Outlook crashes and opens in Safe Mode starting March 12 2026
• [FIXED] Users get errors 0x800CCC0E & 0x800CCC0F synchronizing Gmail and Yahoo accounts in classic Outlook
• [FIXED] Users might get the error "This is not a valid style name" in classic Outlook
• [INVESTIGATING] Users may get the error "Can't connect to the server" when creating groups in classic Outlook
• [FIXED] Classic Outlook replaces accented and extended characters with question marks

Outlook Known issues in February 2026 updates

• [INVESTIGATING] Mouse pointer disappears when hovering over classic Outlook
• [FIXED] Classic Outlook recipients are unable to open "Encrypt Only" emails
• [INVESTIGATING] Users get error "There was an error reading the rules from the server" after making changes to rules in classic Outlook
• [BY DESIGN] Users might get an error applying an encrypted sensitivity label when replying to an encrypted message sent from an external organization
• [INVESTIGATING] Users may experience an error when updating a meeting in their own or a shared calendar
• [FIXED] Classic Outlook profiles with POP accounts and PSTs hang after Windows updates on January 13, 2026
• [FIXED] Classic Outlook adds table borders to signatures after updating to Version 2512

Outlook Known issues in January 2026 updates

• [WORKAROUND] Error opening encrypted emails from classic Outlook: "Configuring your computer for Information Rights Management"
• [FIXED] Unable to report meeting items as junk in classic Outlook

Outlook Known issues in December 2025 updates

• [FIXED] Classic Outlook shows error "Contacting the server for information"
• [FIXED] Error “The text formatting command is not available” when opening emails in classic Outlook or documents in Word for Windows
• [FIXED] Contact Groups created from Outlook contacts get added with /o=ExchangeLabs

Outlook Known issues in November 2025 updates

• [FIXED] Attaching a OneDrive file through a web add-in causes recipient access errors in classic Outlook

Outlook Known issues in October 2025 updates

• [FIXED] Error opening classic Outlook: "Cannot start Microsoft Outlook. Cannot open the Outlook window. The set of folders cannot be opened. The attempt to log on to Microsoft Exchange has failed."
• [FIXED] Known issues with classic Outlook Desktop Shared Calendar Improvements
• [DEPRECATION & PRODUCT CHANGE] Outlook GPO Update for “When sending a message” policy

Outlook Known issues in September 2025 updates

• [INVESTIGATING] Classic Outlook issues with service assisted search for shared mailboxes
• [FIXED] Classic Outlook Contacts that have an X509 S/MIME certificate added to the Global Address List can no longer be edited with Operation Failed error
• [FIXED] Classic Outlook cannot open a shared calendar with a contact created from the Global Address List
• [FIXED] The Edit Contact button stopped working with Version 2507 in classic Outlook
• [WORKAROUND] The "Join" button opens a wrong URL in recurring Zoom meetings in Outlook
• [FIXED] Classic Outlook jumps in the message list when clicking an email or scrolling
• [FIXED] Cannot open the Automatic Replies setting of a shared mailbox in Classic Outlook
• [FIXED] Outlook desktop alert notifications open behind other applications

Outlook Known issues in August 2025 updates

• [WORKAROUND] Error code 30094-27 when updating Office
• [DEPRECATION] Outlook Today and Folder Home Pages deprecation
• [FIXED] Error when opening a saved .MSG file twice in classic Outlook

Outlook Known issues in July 2025 updates

• [DEPRECATION] Custom form script is now disabled by default
• [FIXED] Certain users enrolled in the Microsoft 365 Insiders Program cannot launch classic Outlook for Windows
• [FIXED] Classic Outlook crashes opening or starting a new email
• [FIXED] Classic Outlook Copilot Chat appears available for GCC-M users, when the license is unassigned or the app is blocked

Outlook Known issues in June 2025 updates

• [FIXED] Opening SMIME signed OME protected email causes error “You have changed this message”
• [FIXED] Shared mailbox folders flicker and move around when trying to move items to the folders
• [WORKAROUND] Outlook Desktop Me Control account manager does not sign in for on premise users running in a hybrid environment
• [FIXED] When trying to sign in to an Office app, users might receive a consent dialog labeled AugLoop.All (TEST Augmentation Loop MSIT)

Outlook Known issues in May 2025 updates

• [INVESTIGATING] Text predictions unexpectedly become unavailable and are missing in Outlook options
• [FIXED] Errors CAA2000B and 4usqa when trying to sign in to classic Outlook
• [FIXED] CPU spikes when typing in classic Outlook for Windows
• [FIXED] Classic Outlook mail merge hangs trying to initialize Word

Outlook Known issues in April 2025 updates

• [FIXED] Outlook Calendars render blank sections in Calendar View
• [FIXED] The paste special shortcut Ctrl+Alt+V stopped working in classic Outlook
• [FIXED] Classic Outlook jumps when scrolling Newsletter emails
• [FIXED] Users may notice that the incorrect timeslot is selected after clicking a meeting in the Calendar
• [FIXED] Word, Excel, or Outlook might stop responding after installing the KB5002700 security update for Office 2016
• [FIXED] Classic Outlook display language is English only when installed via standalone download

Outlook Known issues in March 2025 updates

• [FIXED] Classic Outlook errors on startup "The required file msls70.dll cannot be found in your path"
• [WORKAROUND] Outlook icon on the Start menu is not updated to Outlook (classic)

Outlook Known issues in February 2025 updates

• [FIXED] Unable to drag and drop emails to folders in classic Outlook
• [FIXED] Advanced Typography settings are missing in classic Outlook and Word
• [INVESTIGATING] Outlook 2016 MSI is not showing sender in search results

Outlook Known issues in January 2025 updates

• [WORKAROUND] Classic Outlook crashes on reply and forward
• [FIXED] Classic Outlook and Microsoft 365 applications crashing on Windows Server 2016
• [FIXED] Unable to add a Gmail account to classic Outlook
• [FIXED] Classic Outlook hangs when using the Copy shortcut
• [FIXED] Page Title is blank when you send a meeting from classic Outlook to OneNote

Outlook Known issues in November 2024 updates

• [FIXED] Classic Outlook Report button not removed after setting "Use a non-Microsoft add-in button"
• [FIXED] Signatures are not syncing between Outlook Desktop and Outlook Web App
• [WORKAROUND] Classic Outlook errors opening more than sixty emails at the same time

Outlook Known issues in October 2024 updates

• [FIXED] Outlook blocks copying meetings with "Copying meetings is not supported."
• [FIXED] Outlook Junk filtering is running but the Junk Email Options settings are removed
• [FIXED] Classic Outlook reminders dialog not drawing properly and Dismiss button missing
• [FIXED] Outlook Desktop is unable to apply labels with encryption

Outlook Known issues in September 2024 updates

• [FIXED] Emails sent using Outlook Desktop results in Non-Delivery Report [0x80040305-0x00000000-0x00000000]
• [INVESTIGATING] Admins cannot enforce specific settings
• [FIXED] Unable to sign in or add a Gmail account to classic Outlook
• [FIXED] Outlook, Word, or OneNote unexpectedly close when typing

Outlook Known issues in August 2024 updates

• [FIXED] Outlook prompts security notice opening .ICS files after installing protections for Microsoft Outlook Information Disclosure Vulnerability released: Dec 12, 2023
• [FIXED] Print to PDF is blocked if Mandatory Labeling is enabled
• [WORKAROUND] Classic Outlook unexpectedly closes at start up on faulting module ucrtbase.dll
• [RESOLUTION] Teams Meeting add-in is missing in Outlook Desktop after updating to New Teams

Outlook Known issues in July 2024 updates

• [FIXED] Outlook shows conflict errors when updating or cancelling meetings
• [INVESTIGATING] Meeting request is missing from organizers calendar
• [WORKAROUND] Unable to open a shared calendar in Outlook Desktop

Outlook Known issues in June 2024 updates

• [WORKAROUND] Outlook error "The operation failed" if the message has a retention policy
• [BY DESIGN] Error when selecting Scheduling Poll in Outlook for Windows
• [FIXED] Error replying to encrypted emails from Outlook Desktop
• [WORKAROUND] Outlook sync issues cause emails to be stuck in the Outbox and undeliverable mail items
• [INVESTIGATING] Error when opening calendar events in a Room mailbox from Scheduling Assistant
• [FIXED] Outlook email is delayed while a web add-in is working on the send request
• [WORKAROUND] Modern Authentication Methods now needed to continue syncing Outlook Email in non-Microsoft email apps
• [FIXED] Outlook Desktop calendar Out of Office color indicator unexpectedly changed

Outlook Known issues in May 2024 updates

• [BY DESIGN] Contacts in the Outlook Address Book are listed multiple times
• [FIXED] Recall Message in Outlook Desktop stops working after February 2024 security updates
• [FIXED] Outlook Desktop cannot load the contact card and gets stuck at "Loading"
• [FIXED] Outlook Desktop is slow to save attachments to a network path

Outlook Known issues in April 2024 updates

• [BY DESIGN] The dismiss option is no longer available for mentions and reactions in the Outlook Notifications pane

Outlook Known issues in March 2024 updates

• [FIXED] Outlook replies or forwards cause non-delivery error "Your message did not reach some or all of the intended recipients"
• [FIXED] Unable to send emails from QuickBooks using Outlook Desktop after update to Version 2402
• [WORKAROUND] Outlook stops responding when you attach an email .MSG file
• [DESIGN LIMITATION] Outlook Desktop error with Advanced Find when searching online archive with auto-expanding folders
• [FIXED] VoiceMail forms do not work in Outlook Desktop
• [FIXED] Unable to edit Contacts, Appointments, Meetings, or Tasks within Outlook
• [FEATURE CHANGED] Inserting a link as an attachment has changed in Outlook Desktop

Outlook Known issues in February 2024 updates

• [FIXED] Outlook Desktop Exchange ActiveSync connections stopped working in Version 2401
• [WORKAROUND] Outlook and other apps are unable to connect to Outlook.com when using Basic authentication
• [FIXED] Characters converted to Kanji become invisible in Word and Outlook
• [FIXED] SharePoint nested folder links in Outlook Desktop open to the root folder Documents
• [FIXED] Outlook unexpectedly has an App Search bar above the message list

Outlook Known issues in January 2024 updates

• [FIXED] Searching Current Folder of an auto-mapped shared mailbox in Outlook Desktop returns no results or results from other folders
• [FIXED] Outlook error "Cannot move the items" when moving items to other folders
• [WORKAROUND] Outlook starts up slowly and hangs at splash screen when REST to MAPI is unexpectedly toggled

Outlook Known issues in December 2023 updates

• [RESOLUTION] Outlook blocks opening FQDN and IP address hyperlinks after installing protections for Microsoft Outlook Security Feature Bypass Vulnerability released July 11, 2023

Outlook Known issues in November 2023 updates

• [FIXED] Outlook Desktop crashes sending an email from Outlook.com accounts
• [RESOLUTION] Images are blocked and meeting body is read only in Outlook Desktop if calendar items are from external senders for Microsoft Outlook Spoofing Vulnerability released August 8, 2023
• [FIXED] Office file links and attachments in Outlook Desktop show to be in Protected View but do not open
• [INVESTIGATING] Error "Something Went Wrong [1001]" signing in to Microsoft 365 Desktop Applications
• [FIXED] Outlook errors "Cannot send this item." replying to an email
• [FIXED] Outlook Desktop signature auto enters when typing an email
• [FIXED] Error when opening Actionable Messages

Outlook Known issues in October 2023 updates

• [WORKAROUND] Quick Print stops printing PDF attachments in Outlook Desktop
• [FIXED] Unable to view private items in a shared calendar using MAPI in cached mode in Outlook
• [DEPRECATED] Weather is no longer displayed on the Calendar in Outlook

Outlook Known issues in September 2023 updates

• [FIXED] Outlook unexpectedly prompts to reopen items from your last session
• [FIXED] Script Error in Outlook when clicking "Microsoft Office Online" from the Shortcuts function
• [FIXED] Outlook Desktop crashes sending a meeting invite that includes a Loop component

Outlook Known issues in August 2023 updates

• [FIXED] How to add a Yahoo IMAP account to Outlook Desktop without an App Password
• [FIXED] Unable to add a Poll to emails in Outlook Desktop

Outlook Known issues in July 2023 updates

• [FIXED] Outlook prompts "Retrieving templates from server" after selecting the From field drop down
• [FIXED] Outlook errors printing tasks or contacts that exceed a page in length

Outlook Known issues in May 2023 updates

• [INVESTIGATING] Touch mode does not work when using hosted applications in Outlook Desktop
• [WORKAROUND] Outlook for Windows doesn't show all owners of a distribution group
• [FIXED] Outlook unexpectedly opens a browser window if OWA is disabled

Outlook Known issues in April 2023 updates

• [FIXED] Microsoft 365 group users may be unable to view or access group calendars and email messages in Outlook Desktop
• [FIXED] No results when searching in Outlook with Suggested Searches for specific queries
• [FIXED] Incorrect or no results when searching auto-expanding archives in Outlook
• [WORKAROUND] When creating a Quick Step for New E-mail To, Outlook does not save it

Outlook Known issues in March 2023 updates

• [FIXED] Can't sign in to Outlook with Outlook.com account
• [FIXED] Calendar Week search switches from List View to Agenda Summary View
• [FIXED] Calendar events missing in Scheduling Assistant
• [FIXED] Problems syncing shared calendars when enabling "Can view title and location" permissions

Outlook Known issues in February 2023 updates

• [FIXED] Unable to dismiss shared calendar reminders for Outlook.com accounts in Outlook Desktop
• [WORKAROUND] Extending an all-day event on a shared calendar unexpectedly shortens or lengthens the event
• [FIXED] Duplicate shared Calendar(s) after transitioning between Mail and Calendar modules
• [FIXED] No results when searching with the built-in ‘Received' filter in Outlook
• [FIXED] Flickering observed in Outlook Calendar while scrolling

Outlook Known issues in January 2023 updates

• [WORKAROUND] Can't create a Teams Meeting in Outlook because the Teams Meeting add-in has become disabled

Outlook Known issues in December 2022 updates

• [WORKAROUND] Unable to use the undo keyboard shortcut with hosted applications in Outlook Desktop
• [WORKAROUND] Can't move searched items to other folders beyond the sync slider limit

Outlook Known issues in October 2022 updates

• [WORKAROUND] Can't configure Exchange Online mailbox in Outlook Desktop
• [FIXED] Outlook cannot display contacts in People View
• [WORKAROUND] Outlook IMAP or POP server unexpectedly terminated the connection, and the server was interrupted
• [WORKAROUND] Outlook closes shortly after it is opened

Outlook Known issues in September 2022 updates

• [WORKAROUND] Users can't print translated content in Outlook
• [FIXED] Junk email messages multiplying without user actions in Shared Mailboxes
• [FIXED] Shared mailbox is not automatically refreshing for new email in Outlook

Outlook Known issues in August 2022 updates

• [FIXED] Outlook stops responding when viewing Uber receipt emails and some other emails with tables

Outlook Known issues in July 2022 updates

• [WORKAROUND] Delegate can view their Manager Online Archive Calendar in Outlook and Private Items in Online Archive Mailbox
• [FIXED] Outlook hosted application displays incorrect or missing information
• [FIXED] Internet connectivity issues in M365 apps after a change to the IP address range
• [INVESTIGATING] Shorten Appointments and Meetings settings for Outlook might appear greyed out
• [FIXED] Outlook Search might not display recent emails on Windows 11

Outlook Known issues in June 2022 updates

• [FIXED] Incorrect or no results when searching the Online Archive of a Full Access mailbox
• [FIXED] Outlook 2019 sender email address missing on reply and forwards

Outlook Known issues in May 2022 updates

• [WORKAROUND] Error 'This web browser does not support JavaScript or scripts are being blocked' when adding a Google Workspace account

Outlook Known issues in April 2022 updates

• [WORKAROUND] Error expanding Contact Group in Outlook Desktop
• [RESOLVED] Outlook error creating Teams meeting "Sorry, you need to sign out of Teams and sign in again before you can schedule your meeting"
• [FIXED] Blank room lists in Room Finder for GCC Tenants
• [WORKAROUND] Outlook errors "Not Implemented" when Reply All to email on ARM devices

Outlook Known issues in March 2022 updates

• [WORKAROUND] Outlook PDF preview error: This file cannot be previewed because there is no previewer installed for it
• [FIXED] Holiday is missing and has inaccurate date in Outlook for United Kingdom
• [FIXED] Outlook stops connecting to Windows 7 and legacy Windows Server versions

Outlook Known Issues in December 2021 updates

• [RESOLVED] Outlook Search not showing recent emails after Windows update KB5008212

Outlook Known Issues in November 2021 updates

• [FIXED] Search results for Find Related Messages in Conversation are incomplete or missing

Outlook Known Issues in October 2021 updates

• [FIXED] Conflicts in Outlook task
• [FIXED] Outlook cannot add guest groups in Microsoft 365
• [WORKAROUND] Hosted applications in Outlook error: We can't open the Teams App right now. Please try again later
• [FIXED] Outlook Today view is blank on Azure Active Directory joined machines
• [WORKAROUND] Outlook search does not return results after upgrade to Windows 11

Outlook Known Issues in September 2021 updates

• [FIXED] Search results for Outlook Suggested Searches are not accurate, incomplete, or missing
• [WORKAROUND] Characters are displayed as SBC (Single Byte Character Set) after using the "@" symbol when IME (Input Method Editor) is turned on
• [WORKAROUND] This browser does not support security keys - Error when adding a Gmail account to Outlook

Outlook Known Issues in July 2021 updates

• [FIXED] Outlook Crash when using Search or Search Suggestions

Outlook Known Issues in June 2021 updates

• [FIXED] Outlook crash when using "Find Related" search feature in the Tasks Module

Outlook Known issues in May 2021 updates

• [FIXED] "The properties of the message have been changed" prompt when forwarding/replying in Outlook
• [FIXED] Calendar meetings showing legacyExchangeDN instead of DisplayName
• [FIXED] 401 authentication error when opening Room Finder
• [FIXED] AutoComplete list scrolls off the screen in Outlook

Outlook Known issues in March 2021 updates

• [INVESTIGATING] Follow up flag status is incorrectly displayed in sent messages

Outlook Known issues in December 2020 updates

• [FIXED] Outlook crashes after renaming an email signature

Outlook Known issues in November 2020 updates

• [INVESTIGATING] Emails deleted from Outlook.com are reverting back to the Inbox
• [FIXED] Embedded images in Rich Text formatted emails or fields are being blanked out or misaligned

Outlook Known issues in October 2020 updates

• [FIXED] Outlook and other apps won't remember password after Windows Updates
• [INVESTIGATING] Outlook errors marking task complete and sending task status report

Outlook Known issues in September 2020 updates

• [FIXED] End by field is not displayed correctly in the Appointment Recurrence dialog box
• [FIXED] Shared Calendars cannot be closed and gets cleared upon application restart

Outlook Known issues in August 2020 updates

• [FIXED] From address not shown on meeting request when the request is sent from a secondary account

Outlook Known issues in July 2020 updates

• [FIXED] Outlook DLP policy tips not working for certain conditions in email body and attachments
• [FIXED] Outlook fails to start and may prompt to open in Safe Mode on July 15, 2020
• [FIXED] Outlook crashes deleting three or more emails from a POP account with Download Headers Only
• [FIXED] Office Applications crash due to Nahimic audio driver
• [FIXED] Outlook crashes in OLMAPI32!CopyProps function when using applications that process emails

Outlook Known issues in June 2020 updates

• [FIXED] Translate option is missing from Outlook
• [FIXED] Something is wrong with one of your data files and Outlook needs to close
• [FIXED] Windows cannot find "c:\program files\microsoft office\root\office16\outlook.exe

Outlook Known issues in April 2020 updates

• [WORKAROUND] Outlook search folders show unexpected mail items with an empty subject
• [FIXED] "Allow Forwarding" option is missing from "Response Options" for a shared calendar
• [FIXED] Outlook stops opening .msg and .oft template files

Outlook known issues in the March 2020 updates

• [FIXED] "Access Denied" when launching an Office add-in
• [WORKAROUND] Cannot select From account in email with Outlook Desktop

Outlook known issues in the January 2020 updates

• [FIXED] Outlook prompts for credentials for on premise users with Office 365 client
• [FIXED] Unable to send emails from QuickBooks, Office applications, or all Windows applications that allow to send files as attach
• [WORKAROUND] Unable to save changes to a draft email in Draft folder for IMAP accounts
• [WORKAROUND] Japanese characters in Group emails are garbled or missing when formatted as Plain Text
• [FIXED] Unable to add a Gmail account to Outlook - Allow button grayed out
• [FIXED] Unable to add a Gmail account to Outlook "Could not sign you in to Google"
• [FIXED] Outlook users who are booking delegates that add a Room to a meeting invite may notice duplicate emails requesting responses

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