All messages that were trashed in Outlook still appear in All Mail when accessed using webmail, even days later. With that said - the "delayed syncing" issue that I am experiencing is happening on Inbox as well as Junk folders. So my Junk folders do not have that box checked, but the Inbox doesn't have a box to be be checked - their behavior is the same they are both not syncing, until I manually click on them to force the sync. I have half dozen mail accounts a few microsoft a gamil and some other ones and there is no difference they are all acting the same. In this article, I have explained various ways to solve IMAP folders are not syncing.

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 news 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

I work in a small company and for the past 2 weeks we've been having issues with customer support Outlook account. The account is used as IMAP in all customer support clients, every time you set up the mail in anyones computer recreate Outlook profile step by step it just sync 30-50GB ost files... And because of the size, this is making the mail simply stop working after one day of normal use, forcing the users to end outlook process to make the mail sync again properly... But only when you close/open the mail again.

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

If the server is down and you are experiencing issues, the problem IMAP folder is not syncing occurs. So, check the status of your IMAP server follow the steps below. These a general steps to check your IMAP settings in any email application. With the help of this, you can also ensure that the server settings are properly configured or not.

• See the attached picture for the Properties window for a user-created folder.
• 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.
• Simply enter your email address OR username in order to reset your password.

My accounts in Mail app stopped to sync post update

When you are dealing with any problem, it is important to understand the reasons behind the issues. Below are some causes that contribute to the problem. There are various variables at play here however, generally speaking, Outlook performs best when operating as a front end for Microsoft Exchange and Gmail when accessed via a web browser. 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. If disable faulty add-ins in Outlook you can, turn off IMAP, require 2FA, and use the native outlook client. Hate to be a Debbie Downer, but why are you using IMAP?

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Mohit is a Microsoft Certified expert for all things Microsoft. He brings a unique perspective gained from nearly a decade of active participation in various IT forums, blogs, and social media. Through this hands-on experience, he has acquired knowledge in diverse domains like Microsoft 365 Cloud, On-Premise Exchange Server, AD, and Entra ID. At first, I was thinking it may be an issue with certificates, but it's not... I went to a bunch of online TLS tests and the mail server is fine and the certificates are trusted...