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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. See the attached picture for the Properties window for a user-created folder. If these methods do not work, then contact the support team of your email provider. So, here are the solutions you solve the problem of the IMAP folder not syncing.

Why IMAP Folder is Not Properly Syncing?

Please report suspicious activity using the "Report Abuse" option. Windows 10 will reach EOS (end of support) modern authentication troubleshooting on October 14, 2025. For more information, see this article.

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I use both webmail and Outlook desktop client to access my Gmail. I am normally looking at the All Mail folder on Outlook. Whenever I drag messages from the All Mail folder to the Trash folder on Outlook, these messages solve Office 365 mailbox sync delays remain visible in the All Mail folder when accessed via webmail.

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

The responsables of the mail told us to move all the mails from past years to a new account to reduce it's size, but after doing that it doesn't seems to be working. This problem isn't anything new, this happens every year or so, but this time it just isn't getting fixed. By reporting abuse, a moderator will be asked to review the content of this interaction to take further action, if necessary. Some reference links I read thru though I don't fully understand all of what is being discussed. I have not tried the add-on yet I am going to experiment.

Meanwhile, the "connecting" or "Checking for mail..." just stays on the bottom status bar of the mail app.I will try the safe starts and experiment with the buttons ans see if it improves.My VPN was working in the background, even though the file was closed.After instalation ios 18 all my accounts in mail app stopped to sync( including icloud mail).By reporting abuse, a moderator will be asked to review the content of this interaction to take further action, if necessary.

My accounts in Mail app stopped to sync post update

I am also running QuickFolders and its the same nothing shows up on those tabs until i physically click on them. Ok so my mistake the Properties option is there when right Fix Outlook Not Opening After Windows Update clicking folder - I was only focused on right clicking on the email address to take me to server setting I was not clicking on the actual folder. I right click a folder and Properties and it take me to attached windows. I don't see - 'When getting new messages...

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Wonder if the vpn is causing an issue. Perhaps something in TB needs to be tweaked. I have no firewall monitors running during the day that would interfere just the vpn. I have several email accounts / IMAP set-up. So looking at my tree of email accounts one inbox might have 10 mail total and 3 unread form earlier.