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?

Meanwhile, the "connecting" or "Checking for mail..." just stays on the bottom status bar of the mail app. I deleted the Apple Mail Troubleshoot Office 365 Sync and Login Issues app from the phone, reinstalled from the App Store. So only wait when some "smarties" from apple IT solve problem in app ... Apple programmers use no CD/CI - simple sometimes update by "sales-manager requests", and without any critical-bug-checks ... Full cleanup of ALL accounts is not a solution(and re-add even helps not).

Chosen Solution

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 Exchange connectivity diagnostic 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)

These methods help you in the synchronization process. If this does not work, you can contact your email provider. After that, it is also important to secure your IMAP folder to prevent this issue from happening in the future. So, properly follow the above steps and backup your data from IMAP folders. When you right-click one of the folders that doesn't show new mail unless you select it, Properties, is the box 'When getting new messages... It's usually not checked by default for IMAP to minimize network traffic.

• With the help of this, you can also ensure that the server settings are properly configured or not.
• It's just that the contents seem completely disconnected from what I see using webmail.
• 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.
• 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

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. The issue is; just looking at my email accounts and the numbers shown next to the folders I cant solve Office 365 mailbox sync delays tell if there is new mail or not until I click on them. I have all desktop alerts turned off I prefer it this way I don't need all of that. I just want to be able to look and see new message. Even if I have an account with zero message I need to click to see the new ones there are no numbers appear.

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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...