Full cleanup of ALL accounts is not a solution(and re-add even helps not). I also noticed that some IMAP settings — like the root folder path (e.g. "INBOX") — are not available in the new Outlook, which makes troubleshooting more difficult. In the classic Outlook, I would normally check or adjust these. All default folder will show up as top-level ones and mail will start populating to the Inbox folder. For faster and more reliable delivery, add to your trusted senders list in your email software. Simply enter your email address OR username in order to reset your password.

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Furthermore, when calendar invites are accepted using the Outlook client, they disappear from All Mail and go into the Trash folder, but when using WebMail, they remain in the Inbox. I have seen this disparity for years across different Outlook client versions and Windows versions. I also posted on flush DNS and re-sync Outlook the Gmail subreddit about a year ago.

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Creating a new OST file clears up a host of weird problems with Outlook. This also caused some issues as outlook did not know where to store deleted or sent items and through up several errors. What about changing the root folder path, in account settings, to "Inbox". It seems to do the send and inbox repair tool alternative receive and get new mail when in offline mode, but not when online.

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By web app, I mean webmail accessed via Firefox or Chrome for (say) Windows 10, not smartphone app. My comment about 3rd party email -- is a 3rd email app called Email - Edison Mail (from the App Store) I set up my mail accounts in the app and everything works as it should. I’ve tried repairing the data file, removing and re-adding the account, rebooting, re-installing Outlook/Office, running SFC/DISM, all to no avail. Their webmail works fine, and when this account is added to the Windows Mail app, everything works perfectly. One word of warning - you shouldn’t set that interval to more often than maybe every 10 minutes, every 5 would be the absolutel minimum I’d set. If you set too often you run the risk that Outlook could start the next download before finishing the previous download and that could cause duplicate messages and other possible issues.

My accounts in Mail app stopped to sync post update

I am using TB for just three weeks now and I have issues daily credential loop in Microsoft 365 when sending mail with no attachments the outgoing mail server will time out. Since the sync issue is universal it appears to be a global issue. Perhaps something in TB needs to be tweaked. I have no firewall monitors running during the day that would interfere just the vpn. With that said - the "delayed syncing" issue that I am experiencing is happening on Inbox as well as Junk folders.





Just a few seconds after sending, my phone will show that I have a new message on my IMAP, but currently I have been waiting 10 minutes on my Outlook (2 send and receives) and no email listed yet. If an IMAP Inbox isn't displaying new messages as they arrive at the server, but only when the Inbox is selected, there is something wrong with the setup. Run TB in safe mode (hold Shift when you launch TB) and see if it makes any difference. Note also that when you click Get Messages, only the currently selected account is checked; click the drop-down to check a specific account or Get All New Messages (Shift+F5). The setting isn't present for folders that are automatically checked, such as Inbox.

• This limits the amount of network traffic and improves performance for syncing important folders.
• We only have a handful of people who use the their email across multiple devices at the corporate office.
• These methods help you in the synchronization process.
• Full cleanup of ALL accounts is not a solution(and re-add even helps not).
• My comment about 3rd party email -- is a 3rd email app called Email - Edison Mail (from the App Store) I set up my mail accounts in the app and everything works as it should.
• Look at the mail server settings boxes for password and port settings they’re the ones you need to delete and reapply.
• From what I’m reading, this doesn’t actually appear to be an issue with receiving email, it’s an Outlook screen refresh issue, or possibly (although less likely) an issue with notification settings.
• I went to a bunch of online TLS tests and the mail server is fine and the certificates are trusted...

I deleted the Apple Mail app from the phone, reinstalled from the App Store. It's just a little bit technical, but we have an IMAP proxy that chooses from some different backend IMAP servers. If the user account ends up on an old IMAP server implementation (in that case f.i. a Cyrus imapd 2.4.17), IMAP Client of iOS 18 Mail app doesn't work.

IMAP folder sync issue in the new Outlook (moved emails not syncing to webmail)

Looks like at this point there still is not a fix? I am stumped as it the rest of our team. Paying $6 per month vs our current $1.50 per month is a pretty big increase on a yearly basis. We wouldn’t use many of the features included in office 365 to warrant paying the additional cost. Varatex - Outlook in Safe mode did not seem to help.



These methods help you in the synchronization process. If this does not work, you can contact your email provider. After that, it is also important to secure your IMAP folder to prevent this issue from happening in the future. So, properly follow the above steps and backup your data from IMAP folders. I am aware of the difference between Gmail's labels vs. Outlook's folders, but I would expect that Gmail does what is necessary to make the folders appear correct over the IMAP connection to Outlook. For example, if I drag a message from Outlook's All Mail folder to Trash, I see that message disappear from the Inbox folder after a short delay.