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  • Dalton Mcclendon
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Opened Nov 24, 2025 by Dalton Mcclendon@dalton22i47466
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IMAP Folder is Not Syncing Issue How to Fix It?

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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 Outlook Not Sending or Receiving Email 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.

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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 mailbox not updating on IMAP have seen this disparity for years across different Outlook client versions and Windows versions. I also posted on the Gmail subreddit about a year ago. After instalation ios 18 all my accounts in mail app stopped to sync( including icloud mail). I can only recive mails but when I delete mails on macbook they are not deleted on iphone. 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.

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.

These are the common reasons why the IMAP folder is not syncing.I use both webmail and Outlook desktop client to access my Gmail.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...So, properly follow the above steps and backup your data from IMAP folders.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.

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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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.

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Reference: dalton22i47466/9689048#1