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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. Hence, the trashing of messages is registering on Gmail. It's just that the contents seem completely disconnected from what I see using webmail.

Why IMAP Folder is Not Properly Syncing?

While these solutions work, there is are chance that it will happen again. To avoid that, you have to take some precautionary steps. Subscribing to a folder makes it appear in the Folder Pane, but one might not always want Outlook Stuck on Synchronizing Folders a folder to be synced automatically if it is mainly an archive folder or one that seldom receives new mail. This limits the amount of network traffic and improves performance for syncing important folders. You should look at your Outlook desktop client settings to review the default synchronization schedule and tweak anything you can to get it to poll Google's IMAP servers more frequently. I access the IMAP servers from 3 different machines, and they all see the changes from each other.

Chosen Solution

Suspect some Apple Dev's have been lazy with some code Outlook OST vs PST repair 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)

Microsoft Outlook is terrible in IMAP. Hence most people only use MAPI with it. If you are forced to use IMAP, I would recommend switching to an alternative E-Mail client like Thunderbird Thunderbird — Free Your Inbox.

Windows 10 will reach EOS (end of support) on October 14, 2025.It's not until I click on that folder I will then see the 10 and 3 and two second later it will sync and new ones will populate.After that, it is also important to secure your IMAP folder to prevent this issue from happening in the future.I am using TB for just three weeks now and I have issues daily when sending mail with no attachments the outgoing mail server will time out.Make a note of the values and delete an overwrite them also check your passwords for both SMTP and IMAP.I checked all 5 of the tabs in this window that expressions is not there.Wonder if the vpn is causing an issue.So only wait when some "smarties" from apple IT solve problem in app ...Perhaps something in TB needs to be tweaked.

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 inbox repair tool alternative 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.

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