How to Fix Sync Issues between Outlook and Exchange Server? Microsoft Q&A

If your Outlook OST file isn’t syncing properly with Office 365, you’re not alone. Thousands of users face corrupted OST files, sync errors, and missing mailbox data after system updates or unexpected shutdowns. In this 2025 guide, we’ll show you how to repair the Outlook OST file and restore seamless email performance without losing important data. If your Outlook inbox isn’t refreshing automatically, leaving you waiting for new messages, you’re not alone. Many Microsoft 365 and Outlook users experience email synchronization problems caused by outdated cache, network delays, or improper settings. Here’s a complete 2025 guide to get your mailbox updating in real time again. In fact if you just turned on MFA and you were not using MFA before you usually end up having to rebuild the profile and clearing the credential manager. If you are saying that they are getting multiple MFA prompts then this is an out of sync issue with the wrong code being used. We strongly recommend letting your organization's Help desk know if your phone was lost or stolen. The Help desk can make the appropriate updates to your account. After your settings are cleared, you'll be prompted to register for two-factor verification the next time you sign i Now, let us start with the manual processes to fix Outlook syncing errors. Outlook and Office 365 sync issues can be frustrating but are almost always fixable. Start with basic network checks, enable Cached Exchange Mode, and repair your data files if needed. For persistent problems, rebuild your Outlook profile or use FixTechGuide’s free diagnostic tools to automate detection of authentication and IMAP errors in second In addition, users who can access their email accounts in Outlook may experience the following issues, indicating the onset of possible mailbox not updating on IMAP corruption in the Outlook profile or damaged PST file. The above solutions are easy for all users to repair, rebuild, or recreate Outlook Profile for Office 365 or Exchange accounts. However, when it comes to repairing Outlook PST or OST files, it is necessary for users to rely on a third-party tool, like the Shoviv Outlook PST Repair Tool. This software lets users quickly repair Outlook PST from any version, including Outlook 2003, 2007, 2010, 2013, 2016, 2019, or 2021. Outlook sync issues mailbox not updating on IMAP can be because of corrupted Outlook OST or PST files. Therefore, now we will know the steps to repair the Outlook data file. When Outlook gets stuck on "Synchronizing Folders", it’s usually a sync or file corruption issue — not a permanent failure. By following these methods step-by-step, you can restore full email synchronization without reinstalling Outlook. FixTechGuide continues to help users resolve Outlook and Office 365 errors quickly and safel The user had Office 2015 and Office 2016 credentials and Teams credentials that we deleted. We checked with Word that the account was connected–it was and the we opened Outlook and it immediately connected. I created a new Outlook profile, and then the old one started working. I wonder if the compuer cached a new logon token or something that the old Outlook profile could use. Also, during the new profile creation, I was only prompted for a password and not for MF When using this solution to recreate or rebuild an Outlook profile for an Office 365 or Exchange account, please make sure that Outlook and its related programs are closed. The steps to access the repair tool vary depending on your operating system. If you can open the original Outlook Data File, you might be able to recover additional items. The Inbox Repair tool creates a backup file with the same name as the original, but with a mailbox not updating on IMAP .bak extension, and saves it in the same folder. There may be items in the backup file that you might be able to recover that the Inbox Repair tool couldn't. When you switch between working online and offline, all email accounts within your Outlook profile are changed. You can schedule this time for yourself with regular appointments and meetings on your calendar. Your calendar should be treated as your real plan for your time — if you have scheduled it, then that is what you are committed to doing at that time. After you finish processing your messages, you should have a clean Inbox and can switch your focus to your calendar and task I’d start by checking if those users are somehow excluded from security defaults or if there’s a conditional access policy overriding them. Also, make sure they’re using apps that support 2FA—older clients sometimes skip the prompt. You can check their sign-in logs in Azure AD mailbox not updating on IMAP to see what’s going on during their login attempt If users are facing syncing issues in Outlook due to corrupt Outlook data files, they must choose a professional tool, like Shoviv OST to PST Converter Tool. This software allows users to process numerous OST files at once without any size limitations. Moreover, it maintains mailbox not updating on IMAP the folder hierarchy and metaproperties of the data when processing Outlook data files. This tool also helps users fix Outlook syncing issues by repairing OST or PST files and syncing the data smoothly. Here, we will discuss the five manual methods to fix sync issues in Outlook or OW