outlook suddenly stopped syncing

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outlook suddenly stopped syncing

Susan Kramer 5

I am connected, IMAP is correct, but it won't send or receive emails. and I have no way to deinstall and reinstall it because it doesnt show up in the uninstall menu - is this because it's part of MS 365? And all your help screens just waste my time - none of that works

Moderator note: Moved from Microsoft 365 and Office Other

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Answer 1

Teddie-D 14,685 Microsoft External Staff Moderator

Hi @Susan Kramer

Thank you for posting your question in the Microsoft Q&A forum.

Since the channel tag has changed, could you provide a bit more detail to help narrow down the issue:

-Which version of Outlook are you currently using (Classic Outlook or the New Outlook)?

-Is the affected account a Gmail or Yahoo account?

There’s a known issue where Gmail and Yahoo accounts stopped syncing in Classic Outlook starting February 26, 2026. Microsoft resolved this with a service-side change on March 20, 2026. If that matches your situation, you may want to try the workaround described in this Microsoft Support article: Users get errors 0x800CCC0E & 0x800CCC0F synchronizing Gmail and Yahoo accounts in classic Outlook …

1.Close Outlook.

2.Right‑click the Windows Start button, select Run, type regedit, and press OK.

3.In the Registry Editor, paste this path into the address bar and press Enter:

Computer\HKEY_CURRENT_USER\Software\Microsoft\Office\16.0\Common\Identity\Identities

4.Under Identities, check each subkey until you find the one that matches the email address that is not syncing.

5.Delete the Identities registry key, example in red below. Look for the corresponding Gmail or Yahoo email address, example in purple. That is the identity key in the left column to delete. After you delete the key, restart Outlook and sign in again.

Reg edit example

Please know that while our initial response might not resolve the issue right away, your input is incredibly valuable. With a bit more detail, we’ll work together to find the best solution for you.

Note: Please follow the steps in our documentation to enable e-mail notifications if you want to receive the related email notification for this thread.

Teddie-D 14,685 Reputation points Microsoft External Staff Moderator

2026-03-27T01:28:19.73+00:00

Hi @Susan Kramer
Is there any update on this thread? If you need further help, please provide more detailed information so that we can offer more accurate suggestions.
Susan Kramer 5 Reputation points

2026-03-27T22:12:19.4366667+00:00

I contacted microsoft help and they connected to my machine - she deleted Office and reinstalled but it still isnt working right - it sent all the emails in one email account TO THE TRASH and I am sure I lost some info! Think I'm getting rid of office altogether - can't stand the geeks adding more and more clicks to every process!
Teddie-D 14,685 Reputation points Microsoft External Staff Moderator

2026-03-29T23:40:27.7+00:00

Hi @Susan Kramer
I understand your concern, especially with messages unexpectedly moving to the Trash and the risk of data loss. Since you’ve already worked directly with Microsoft Support through a remote session and followed their guidance to remove and reinstall Office, this situation goes beyond what can be addressed here in the community forum.

This is a user‑to‑user support forum, so we don’t have visibility into the specific troubleshooting steps taken during your support session or the current state of your mailbox afterward. Because there’s now a possibility of data loss, the most appropriate next step is to continue working with Microsoft Support. They can review what actions were performed, check available recovery options, and advise you on any remaining steps. That level of investigation isn’t something we can provide from the forum.

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outlook suddenly stopped syncing

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