Skip to content

  • Projects
  • Groups
  • Snippets
  • Help
    • Loading...
    • Help
    • Contribute to GitLab
  • Sign in / Register
F
fran2005
  • Project
    • Project
    • Details
    • Activity
    • Cycle Analytics
  • Issues 7
    • Issues 7
    • List
    • Board
    • Labels
    • Milestones
  • Merge Requests 0
    • Merge Requests 0
  • CI / CD
    • CI / CD
    • Pipelines
    • Jobs
    • Schedules
  • Wiki
    • Wiki
  • Snippets
    • Snippets
  • Members
    • Members
  • Collapse sidebar
  • Activity
  • Create a new issue
  • Jobs
  • Issue Boards
  • Jannie Boatright
  • fran2005
  • Issues
  • #3

Closed
Open
Opened Jan 03, 2026 by Jannie Boatright@jannieboatrigh
  • Report abuse
  • New issue
Report abuse New issue

Outlook stops starting up Cloud Computing & SaaS

Are you having trouble starting Outlook or receiving "Cannot start Microsoft Outlook. Cannot open the Outlook window" error messages? We can fix the problem for you, or you can use the troubleshooting steps we're providing below to help resolve these startup issues. Since your app doesn’t open, you’ll have to use another Office app on your PC to trigger the update. This is because when you update one Office app, it automatically updates all other Office apps on your PC. When your cache files are deleted, launch Outlook, and the app should open without problems.

If you are still facing the same issue, it means your PST file is damaged. If you want to repair your corrupted PST file, opt for the Cigati PST Repair Tool. It will recover the corruption from your desired PST files.

If the problem doesn't occur after you restart Outlook, one of the add-ins is likely the cause of the problem. Restore the add-ins one at a time until the problem does occur to determine which add-in is causing the problem. Make sure that the latest updates for Outlook are installed. For more information, see How to install the latest applicable updates visit Fix Outlook Site for Microsoft Outlook (US English only). Many of these items can be automatically checked by the Classic Outlook Advanced Diagnostics troubleshooter.

Trouble shooter came back as there was a problem running the trouble shooter, try looking for other solutions. When Outlook does open, it will send mail fine one minute and then the next minute it will not send any mail. I agree, it is highly unlikely that all the users would suddenly have an issue that isn’t patch related. Outlook opening problems are simple to deal with.

It is a powerful and almighty software that can be applied to fix corrupt Outlook visit Fix Outlook Site PST files in any scenarios. I just have the hourglass that disappears after a minute. After multiple restarts the program will open one time, then reverts. There are other issues, too, that can contribute. Maybe you've added a new program to your computer that doesn't get along with Outlook, or your system has a virus. Regardless of the specific cause, there are several key troubleshooting fixes to try that might help.

These often help resolve issues without the need to contact support. 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 have email messages in an email program, you must import your email messages and addresses to the new user profile before you delete the old profile. If everything is working correctly, you can now delete the old profile. To manage your mailbox by reducing the size of the Outlook data file, see Reduce the size of Outlook Data Files (.pst and .ost). The above procedures will help you to resolve the Microsoft Outlook Stuck on Loading Profile error.

Specifically around FSLogix (which we use) and a known issue. We’re going to add the registry setting to roam the paths listed in the known issue and re-register appx and see how we go. There are also notes about legacy per-user auth being an issue, however we had two accounts left in per-user auth but none with the issue. If you think that it is patch related, roll back the patch and see if that fixes it for the end users.

Repair an Outlook data file (.pst) fileExit Outlook and browse to one of the following file locations: ...Open SCANPST.EXE.Select Browse to select the Outlook Data File (.pst) you want to scan. ...Choose Start to begin the scan.If the scan finds errors, choose Repair to start the process to fix them.More items...

Here, we list fixes for the possible causes, starting with the most likely culprit. Go in order so you have best chance of getting back to your inbox as quickly as possible. Occasionally, classic Outlook tries to run a process in the background. Auto-archive, sending and receiving a very large attachment, or running some of the other mailbox tools can all be done in the background. Check the status bar at the bottom of the screen to see if another process is running. If so, wait a short time (usually two or three minutes) to see if Outlook starts working again.

I finished the migration for legacy MFA since 1 months but I still have the problem. If none of that worked, I’d restore the server from backup when it was working and see what happens moving forward. If both of those don’t fix it, I’d run a full maintence cycle on the server.

Thankfully, Microsoft Outlook is fully optimized for Windows 10, meaning Compatibility mode is not necessary. You might be wondering what happens when you switch on visit Fix Outlook Site the Compatibility mode for Outlook. When you do this, your Outlook might have opening problems. For this reason, you should always turn off Compatibility mode for Outlook.

Assignee
Assign to
None
Milestone
None
Assign milestone
Time tracking
None
Due date
No due date
0
Labels
None
Assign labels
  • View project labels
Reference: jannieboatrigh/fran2005#3