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on December 30, 2025
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When this happens either the shared mailbox or your main Inbox might stop syncing. The Offline Outlook Data File, however, can get corrupted or become unreadable from within Outlook. This quick action could actually bring the shared mailbox back in sync again. Try to disconnect and connect back the Shared Mailbox to your Outlook profile. With the exception of the FixTechGuide support for Office 365 mailbox owner, anyone else who needs to access the additional mailbox (and configure it on his Outlook profile) must be granted the correct permissions.
Speed Up Slow Outlook Inbox Synchronization
However, with one particular client no matter what changes are made these sync issue still occur. After these instructions, ensure the sync settings are correct and check everything is working well. We're in the process of migrating from On-Premise Exchange to O365. I have a couple of Users and a Shared Mailbox that were migrated and both Users are experiencing issues with the Shared Mailbox updating on a regular basis. Restart Outlook, re-enable the checkbox and see guide to Office 365 sign-in errors if the issue persists. Select the permission level—Editor permissions will provide full access—and click OK.
Enable "Download shared Folders" and "Public folders favorites"
It also provides the option to export the Outlook OST file into Office 365 and Live Exchange mailboxes. This software also has a splitter option to split large-sized PST files into smaller ones, helping users prevent oversized PST file issues. If the shared mailbox is neither accessible nor properly synchronizing on the web app, the problem most likely needs to be fixed at the server level. There are two main actions the mailbox owner will need to take in order to provide another user with access to the shared mailbox. The other solution to fix Outlook sync issues is recreating Microsoft Outlook profile. Sometimes an error appears in the Mail and Calendar apps when the apps try to sync new email or calendar events.
Check the connectivity to your email server
This feature isn't available for Microsoft 365 Government, Microsoft 365 operated by 21Vianet, Fix Outlook and Office 365 Errors 2025 or Microsoft 365 Germany.
Professional automation to resolve Microsoft Outlook syncing issues
In this article, you will learn how to configure a shared mailbox in Outlook and what to do if the shared mailbox is not synchronizing properly. If the size of your .ost file is close to the limit, you could try increasing the limit on your client, restart Outlook and see if there is any difference. If you're using an Exchange account that requires advanced settings, you'll need to remove the account and add it again using advanced settings. To add the account using advanced settings, see Add an account using advanced setup. One of our users hit their Office Gb mailbox limit and is unable to send or receive email. If I check the sync log I see a lot of sync errors for Inbox, sent items and a few other folders.
Essentially, a shared mailbox acts as a centralized service allowing many people to work in a synchronized manner.I’ve tried the Microsoft office uninstall tool provided by Microsoft (which deletes more items then just control panel uninstall).In this article, you will learn how to configure a shared mailbox in Outlook and what to do if the shared mailbox is not synchronizing properly.If you still can't sync your email after removing your account and adding it again, you might need to add the account using advanced setup.Office 365 keeps your mailboxes (shared or individual) on a server called Microsoft Exchange.These are the only two I've seen have this issue and I was wondering if you've seen this and figured out a 'fix'?Select Editor permissions (which will provide full access) and click OK.Before we know the solutions, we will understand a few common causes of the Outlook sync problem.
See below for help on how to proceed if the shared mailbox is not syncing. Once your shared mailbox account is ready (created either on Active Directory on-premises or on Azure Active Directory) you can proceed by adding it to your Outlook profile. We’ve had sync issues with employees from time to time however, re doing the mail profile or wiping the Windows profile usually fixes it.