The problem usually occurs due to authentication token mismatches, cached credentials, or browser session conflicts. In this guide, we’ll walk you through every step to fix Office 365 login problems on both Windows and the web version. If none of the above steps work, you may need to use a more advanced troubleshooting tool to diagnose and fix the login issue. A developer console is a feature of most browsers that can be used to inspect and modify the code and elements of a website. To access it, open your browser and go to the website you are trying to Troubleshoot Office 365 Sync and Login Issues log in to, then right-click on the login page and select inspect or inspect elemen


By following the steps in this guide, you’ll gain a clear understanding of your Exchange Server’s connectivity status, enabling you to promptly address any underlying issues. This guide will walk you through the best methods for testing Microsoft Exchange Server connectivity. We’ll cover tools like the Microsoft Remote Connectivity Analyzer, which tests connections from outside the network. We will include third party tools in the list of utilities that you can use as part of your connectivity testing tasks. These allow for in-depth, internal testing of server status and protocol health. Ensuring reliable connectivity to Microsoft Exchange Server is essential for Troubleshoot Office 365 Sync and Login Issues maintaining seamless communication within an organizatio


Start by disconnecting the device from Work or School Account settings, then reconnect with the user’s updated password. Password sync usually fails when credentials don’t update between Microsoft Entra ID (Azure AD) and your on-premises Active Directory. Most of the time, the problem comes from timing delays, configuration mistakes, or cached credentials on devices that don’t pick up new passwords. While M365 is highly stable, it’s not immune to occasional disruptions. The M365 sync establishes a synced dataset based on your M365 data and the filtering configuration of your sync. The sync will fail if it can't find any users that comply with your filtering preferences or the system's requirements for user record


Repairing these files is crucial to recover lost or inaccessible email data. To repair a PST file, use a specialized tool like Shoviv Outlook PST Repair. This tool scans and fixes corruption issues, restoring the integrity of the PST file. The software also repair password protected PST file and recover data successfully. In the Folder Pane, you might see a folder named Recovered Personal Folders that contains your default Outlook folders or a Lost and Found folder. Although the repair process might recreate some of the folders, they may be empt


Upgrade to Microsoft Edge to take advantage of the latest features, security updates, and technical support. If your admin enabled Modern Authentication (MFA), try disabling it temporarily via Azure Active Directory → Properties. Then re-enable it after successfully signing in. Alternatively, generate an app-specific password if using Outlook 2016 or olde


Many users have both personal Microsoft accounts (e.g., Outlook.com) and work/school Office 365 accounts. If both are signed in simultaneously, the system can confuse the authentication path. Log out of all accounts and sign in with only one — preferably the one with your Office 365 subscription. Tell us the issue, no long waits, no tech jargon. If all else fails, or the issue persists despite taking the recommended course of action, open a support reques

Support is available both online through the Microsoft 365 operated by 21Vianet portal, and by telephone for both paid and trial subscriptions. The Microsoft 365 Copilot app brings together your favorite apps in one intuitive platform that keeps your data secure with enterprise data protection. With Microsoft 365, you can designate several types of administrators who serve different functions. This service description uses the generic title administrator to refer to all categories of administrators.


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This is a standard DigiCert wildcard cert that we have replaced every year with no issues. If you can't open Outlook, or Outlook disappears or crashes, one of your add-ins may be to blame or you may need to update Outlook. Right-click the folder, and then click Properties to check your permissions for the folder. See the folder owner or your administrator to change your permission

Self-service support is available for all Microsoft 365 operated by 21Vianet users, and includes troubleshooting tools and videos, help articles and videos, as well as forums and wikis in the Microsoft 365 community. For more self-help resources, see Microsoft 365 operated by 21Vianet. You must be an admin for a business subscription to use these support methods. Explore learning tools to collaborate on projects together and independently, all in one place. Create equitable learning environments that help students develop knowledge with familiar apps essential to both academic and future career success.