Outlook cannot synchronize subscribe folders

Question

Outlook cannot synchronize subscribe folders

Hugo Vizcarra 0

Im getting the message "Outlook cannot synchronize subscribe folders" for all the 4 accounts in my W11 computer using Office 365 with W11. Same case on the only other computer connected in the same office but with W10. Same license on MS 365.unistall

I tried following directions of chatgpt which as similar to the ones suggested in MS Support on line but nothing. Havent uninstall and reinstall Office 365 but tan the Online repair (not quick repair).

Can anyone help?

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Hornblower409 7,660 Reputation points

2026-03-21T06:02:40.7633333+00:00

@Hugo Vizcarra said

I tried following directions of chatgpt which as similar to the ones suggested in MS Support on line but nothing

Does that mean that you have tried the workarounds from both of the Microsoft Support articles on the recent problems with Classic Outlook and IMAP accounts?

https://support.microsoft.com/en-us/topic/users-get-errors-0x800ccc0e-0x800ccc0f-synchronizing-gmail-and-yahoo-accounts-in-classic-outlook-e5a7b684-7c5c-4848-ab2d-d48291451f67

https://support.microsoft.com/en-us/office/unable-to-add-a-gmail-account-to-classic-outlook-4d9530c5-3f40-4e6d-9b45-4477f160828f

If so, then one other possible workaround is what I call the "Start from Scratch" process. See my answer:

"Hornblower409 Mar 19, 2026, 12:37 AM" at
https://learn.microsoft.com/en-us/answers/questions/5827459/i-cannot-add-gmail-account-to-outlook-office-2024

This is a pretty radical workaround. It has you remove the GMail account from Outlook, clear any cached data that Outlook or Windows is holding for that account and then add the GMail account back to Outlook.

Please note Step #1 - Export any data for the GMail account that you have stored only locally in "This Computer Only" folders. Since the OST file it is stored in will be useless once you remove the account.

There is also the possibility that your problem is not due to the recently reported bug. Outlook has been throwing 0x800CCC0E errors for a long time for a lot of different reasons.

Since you are a MS 365 subscriber, you might want to bring in Microsoft Support so they can look at your setup.
https://www.microsoft.com/en-us/microsoft-365/support

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Hornblower409 7,660 Reputation points

2026-03-21T06:02:40.7633333+00:00

@Hugo Vizcarra said

I tried following directions of chatgpt which as similar to the ones suggested in MS Support on line but nothing

Does that mean that you have tried the workarounds from both of the Microsoft Support articles on the recent problems with Classic Outlook and IMAP accounts?

https://support.microsoft.com/en-us/topic/users-get-errors-0x800ccc0e-0x800ccc0f-synchronizing-gmail-and-yahoo-accounts-in-classic-outlook-e5a7b684-7c5c-4848-ab2d-d48291451f67

https://support.microsoft.com/en-us/office/unable-to-add-a-gmail-account-to-classic-outlook-4d9530c5-3f40-4e6d-9b45-4477f160828f

If so, then one other possible workaround is what I call the "Start from Scratch" process. See my answer:

"Hornblower409 Mar 19, 2026, 12:37 AM" at
https://learn.microsoft.com/en-us/answers/questions/5827459/i-cannot-add-gmail-account-to-outlook-office-2024

This is a pretty radical workaround. It has you remove the GMail account from Outlook, clear any cached data that Outlook or Windows is holding for that account and then add the GMail account back to Outlook.

Please note Step #1 - Export any data for the GMail account that you have stored only locally in "This Computer Only" folders. Since the OST file it is stored in will be useless once you remove the account.

There is also the possibility that your problem is not due to the recently reported bug. Outlook has been throwing 0x800CCC0E errors for a long time for a lot of different reasons.

Since you are a MS 365 subscriber, you might want to bring in Microsoft Support so they can look at your setup.
https://www.microsoft.com/en-us/microsoft-365/support

Answer 1

The error indicates Outlook is having trouble synchronizing IMAP subscribed folders for those accounts. Use these steps to verify and reset IMAP folder subscriptions in Outlook, which often resolves “cannot synchronize subscribed folders” issues:

In Outlook Mail, in the folder list, right‑click the top folder for one of the IMAP accounts (the account name itself).
Select IMAP Folders.
Select Query to download the full folder list from the mail server.
In the list, select the folders that should appear in Outlook and choose Subscribe. For folders that should not sync, choose Unsubscribe.
- To select multiple folders, hold CTRL while clicking folder names.
Select OK, then run Send/Receive again and check whether the error persists.

If a folder created on the server is missing from the IMAP Folders dialog:

In Mail, right‑click the top folder for the IMAP account.
Select Update Folder List.
Open IMAP Folders again, select Query, then subscribe to the needed folders and test Send/Receive.

If the IMAP account’s top‑level folder name begins with a number (0–9), Outlook currently cannot perform these IMAP Folders steps for that account. In that case, rename the top‑level folder on the server (if supported by the provider) so it does not start with a number, then repeat the steps above.

If all accounts in the same office show the same error, also confirm with the email/IMAP provider or ISP that the IMAP service is reachable and not blocking connections from the network.

References:

Choose which IMAP account folders appear in Outlook

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Outlook cannot synchronize subscribe folders

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