This happens to accounts that are configured in the iOS Mail app. The loading of unregistered MAPI services has been disabled by default to make Outlook more secure. 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.

The built-in steps to fix Outlook not opening back-off mechanisms in the indexing component of Windows Search or WDS pauses the indexing of Outlook data when the system is under heavy use. The easiest way to let the indexing finish is to leave Outlook running overnight.Additionally, you can reduce performance issues by running Outlook in Cached Exchange Mode. In this mode, Windows Search or WDS searches the local copy of the mailbox instead of the mailbox content on the server. I even reduced mailboxes sizes and that didn’t help, I setup a new user (albeit existing PC but new windows profile), and he is having the same issues. If the mailboxes open automatically after removing them and restarting Outlook, they may be auto mapped. This setting can be changed by an Exchange admin by submitting a request via Jira and including the usernames of the client and the usernames of the mailboxes that need to be removed.

When PST files are beyond the repair scope of the Inbox Repair Tool (ScanPST.exe), third-party PST recovery tools can be a lifesaver. These programs are specifically designed to handle more complex data corruptions. They use advanced scanning and recovery algorithms to parse severely damaged files, reconstruct them, and recover their contents. Restarting your device clears temporary files and can fix minor software conflicts. If the above solutions are not working up to the mark, it simply indicates the corruption in your Outlook PST files.

Problems with Outlook or MS Office program files can cause such problems. In this case, you can try repairing or reinstalling Microsoft Office. If the Outlook issue “outlook keeps crashing Windows 10” persists. Sometimes a program running in the system’s background interferes with Outlook, causing it to crash. So, this problem may be fixed by restarting the system. Running the latest version of Outlook ensures you have steps to fix Outlook not opening the most recent fixes and updates.

It is therefore crucial that these Outlook errors are resolved as soon as possible. This guide discusses methods to quickly fix the Outlook not opening issue in Windows 10. To repair the PST files, you can use the in-built tool ScanPST, which is provided by Microsoft, but it repairs minor corruptions and files up to 2GB only. So you can opt for an automated solution – Kernel for Outlook PST Repair.

In this case, you’ll have to remove your app’s cache to resolve your issue. Should you decide to remove a profile, back up the data files first. All offline cached content will be deleted when you choose Remove. For more information, see Introduction to Outlook Data Files (.pst and .ost). If your issue with Outlook persists, use the repair tool’s “Online Repair” option to fix your app problems. This option takes longer than the first one and requires an active internet connection to resolve your app issues.

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. You can also add the secondary connected accounts (Gmail, Yahoo, etc.) in Outlook.com as additional accounts in the Outlook profile. There will be no screen or visible process when you run the program file. However, it will create a new mapi32.dll file at the same location.

If Outlook is configured to connect to the Exchange mailbox in Online mode, an .ost file is not used. To adjust the number of days of data that are synced for shared folders, add the following registry values. You can limit the synchronization window that’s used for calendar folders to reduce the number of items that are stored locally in your calendar folders.

After the update, reopen Outlook to see if it can work correctly. The free manual solutions to fix Microsoft Outlook keeps shutting down ends here. Now, let us move into the solutions to fix the issue of MS Outlook.

If you’re still having problems, you can try resetting your Windows Firewall settings back to default. Once the add-ins are disabled, close Outlook 2016 and restart the application normally to check whether it now opens as normal or not. You can determine if it’s corrupted by creating a new profile and changing which profile is used when Outlook starts.