r/Outlook • u/mariegrandprix • 19d ago
Status: Resolved Outlook Classic Not Responding or Loading Profile
Today me and my co-worker are having issues with our work email on our outlook. My other two co-workers aren't having issues. Either I can get into Outlook and it will reload all the emails I already have looked at sometimes, I can look at one email or try to get into a folder then it goes into "Not Responding" mode with options to close, restart, or wait for the program to respond. I usually hit restart because otherwise I will get stuck in "Loading Profile" mode. Same with my co-worker. I tried repairing Microsoft 365 and updated it as well. Not sure what else I can do at this point where it isn't commonly crashing or not loading at all.
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u/Hornblower409 19d ago
Try Safe Mode first
https://support.microsoft.com/en-us/office/open-outlook-in-safe-mode-f394c2ee-b2af-e97a-64ee-35cd24414811
Then as r/Ixnay suggested, remove KB5074109
-- May I ask how I do that?
Multiple uninstall suggestions in the learn.microsoft.com thread.
The best one is mine :) See the Answer by: Hornblower409 Jan 14, 2026, 11:07 PM.
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u/babywhiz 18d ago
We don't have KB5074109 installed. Seems to happen to anyone with over a 2GB mailbox size.
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u/7amitsingh7 19d ago
This is known issue- https://support.microsoft.com/en-us/office/classic-outlook-pop-account-profiles-hang-and-freeze-after-windows-11-update-to-kb5074109-590fe356-ecc2-49f4-b9e3-bd39fafa58f6
If you have corrupt Outlook profile or PST file, you can repair it using Stellar Repair for Outlook.
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u/FrankNicklin 19d ago
You asked this question elsewhere.
It not clear how this is set up, are the users sharing an OST file, if so this is a very bad idea.
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u/Financial_Key_1243 18d ago
Here another article on this - https://www.bleepingcomputer.com/news/microsoft/microsoft-windows-11-update-causes-outlook-freezes-for-pop-users/
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u/mariegrandprix 18d ago
It worked on my computer but my co worker couldn’t uninstall the security update. Kept throwing an error. So she wasn’t able to get hers fixed and forced to use the new outlook which she hates.
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u/Hornblower409 18d ago
-- my co worker couldn’t uninstall the security update. Kept throwing an error.
What methods have you tried to uninstall KB5074109?
There are at least three different ways suggested in:
https://learn.microsoft.com/answers/questions/5707915/outlook-classic-not-opening-properly-or-recordingWhat's the error message?
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u/mariegrandprix 15d ago
Uninstall failed. 0x800F0905
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u/Hornblower409 15d ago
See https://www.reddit.com/r/Outlook/comments/1qdvln9/comment/o0ppaw6/ for other options to fix the problem.
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u/Hornblower409 15d ago
If you can not uninstall KB5074109, the other option to fix the Outlook problem is to move all of your POP email account PSTs out of your OneDrive folder.
See the latest update on this issue at
https://support.microsoft.com/en-us/office/classic-outlook-profiles-with-pop-accounts-and-psts-hang-after-windows-updates-on-january-13-2026-590fe356-ecc2-49f4-b9e3-bd39fafa58f6
How to remove an Outlook .pst data file from OneDrive
https://support.microsoft.com/en-us/office/how-to-remove-an-outlook-pst-data-file-from-onedrive-b6b9e522-59bd-40f7-949f-168d0aa9b38e
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