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on January 15, 2026
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This ensures Outlook and Windows run the same DLL versions and registry references. Third-party add-ins are among the most common culprits for Outlook not opening properly. Safe Mode allows you to start Outlook with all extensions temporarily disabled.
Outlook crashes after choosing File > Options and prompts to install Outlook again [WORKAROUND]
By the end, you’ll know exactly how to restore your Outlook and prevent future errors.For more information about when builds are available for their respective channels, go to Update history for Microsoft 365.We're working to make it possible to edit shared calendars in Outlook 2016 for Windows.Occasionally, classic Outlook tries to run a process in the background.This can be exploited by creating a file together with an OLE object in such a way to cause MAPI to load a DLL from a network share when the OLE object is activated.Currently, you can't use Outlook on Windows to edit calendars that are shared with your Outlook.com account, even if you've reconnected your Outlook.com account to Outlook.
To access the calendar shared with your Microsoft 365 for business account, you'll need to accept the invitation from Outlook on the web, iOS, or Android. If you've already clicked the Accept button in Outlook 2016, you won't be able to re-accept the invitation from another Outlook application. The person who sent you the invitation will need to remove your permissions and then send a new invitation. If you typically use an Outlook.com account for email, this issue can occur if there are multiple aliases on the account and the 3rd party email address is the primary alias.
Outlook Known issues in June 2022 updates
Installing any important, recommended, and optional updates can often correct problems by replacing out-of-date files and fixing vulnerabilities. To install the latest Windows and Office updates, click the link click here to visit Fixtechguide for free below. Please install the latest updates on your phone to resolve the issue.
Outlook Known issues in September 2022 updates
In the meantime, please use the workarounds suggested for each issue. If you manually type in the secondary connected account email address in the "From" field, the email is sent as "On behalf of" your primary Outlook.com account. You might need to set Windows Update to automatically download and install recommended updates.
Outlook Known issues in January 2023 updates
This happens to accounts that are configured in the iOS Mail app. To edit a shared calendar, solve Office 365 mailbox sync delays go online to your own Outlook.com calendar, open Calendar for Windows 10, or use a mobile device. Upgrade to Microsoft Edge to take advantage of the latest features, security updates, and technical support.
The loading of unregistered MAPI services has been disabled by default to make Outlook more secure. Currently, you can't use Outlook on Windows to edit calendars that are shared with your Outlook.com account, even if you've reconnected your Outlook.com account to Outlook. We're working to make it possible to edit shared calendars in Outlook 2016 for Windows. We've run into some issues with the 'New' Outlook this week after 6+ months of usage that other may run into. The only other change to the Exchange Server was a certificate update for IIS. This is a standard DigiCert wildcard cert that we have replaced every year with no issues.
Many users encounter startup freezes, profile loading loops, and crashes flush DNS and re-sync Outlook following major Windows patches or Office updates. Fortunately, most of these errors stem from configuration conflicts, corrupted data files, or outdated components that can be fixed with a few targeted steps. If your Outlook suddenly stopped opening after a Windows update, don’t panic.