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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?
My VPN was working in the background, even though the file was closed. That means that Mail app fully connected to server , asked for statuses, but not FixTechGuide Windows update Outlook fix displaying anything. Create your account and connect with a world of communities.

Chosen Solution
Suspect some Apple Dev's have been lazy with some code Outlook stuck updating folders solution in IOS18's mail.app and its causing the issue. I was a little hesitant but went ahead and let it completely remove all the synced items from the account off of my iPhone. After a minute, it was removed so just went and re-added it and BOOM. Decided to just try completely removing my Gmail account, the one that wasn’t syncing with the Mail App after the iOS 18 update.

IMAP folder sync issue in the new Outlook (moved emails not syncing to webmail)
When you synchronize mail using IMAP between Gmail and a desktop mail client such as Outlook, there is a necessary delay between changes made independently at both ends being synchronized in both directions. When you are accessing Gmail via the web application everything is hosted on Google's cloud servers. So it must be something in IMAP protocol handling on the old server that makes the iOS Mail app go out of sync or crash the syncing mechanism on the iOS device. Maybe some encoding behavior or just a different linefeed or something that has changed over the years... Otherwise why even have the ability to auto-sync? If I need to click on each folder to force the sync/download from server then auto sync serves no purpose.
- See the attached picture for the Properties window for a user-created folder.
- If you can, turn off IMAP, require 2FA, and use the native outlook client.
- This anomaly also occurs when using the hosting system (first type), using different names for inbound and outbound servers.
- Their webmail works fine, and when this account is added to the Windows Mail app, everything works perfectly.
- 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.
- I would suggest that frequent changes to folder contents on multiple devices will make it go wrong.
- I’ve never heard of setting a path before for email, so apologies if this is a simple solution to those who come across this in the future.
My accounts in Mail app stopped to sync post update
The problem is that the some changes are not reflected in the Gmail web app. By Office 365 Sync Errors Fix web app, I mean webmail accessed via Firefox or Chrome for (say) Windows 10, not smartphone app. To set up a mail account, we can set the same standard name "mail.mydomain.com" as the incoming and outgoing mail server. 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.

Microsoft, gmail and other popular accounts should sync automatically, but if they don't, I'm inclined to think it's due to the VPN or a security/antivirus app that is scanning the TB profile folder. But many users run into the problem where their important IMAP folders are not syncing or stop updating. That’s why, here I am to help you in this situation by providing you with solutions. But, before that, let’s understand the cause of the issue.