It won’t hurt to clear out all of these stored passwords from time to time anyway. If you are unable to install the latest update for Outlook 2010 or Outlook 2013, you can work around this issue by removing all previously saved credentials. To remove stored credentials and force Outlook to use your Windows desktop credentials, follow these steps. You should make sure to put a check in the box that says "Remember my credentials

If Outlook still doesn’t sync, create a new mail profile. Head to Control Panel → Mail → Profiles → Add and add your account credentials again. A corrupted OST file can pause your business communication, but with these repair steps you can restore your Outlook in minutes. Follow each method carefully, keep your account synced to Office 365, and maintain regular backups to avoid future data loss. You’ll see files ending with ".ost" — these store your cached mailbox data. Yes — Outlook will re-sync mailbox data from the server once you relaunch the app, as long as you use an Exchange or Office 365 account.


This ensures Outlook and Windows run the same DLL versions and registry references. Third-party add-ins are among the most common culprits for Outlook not opening properly. Safe Mode allows you to start Outlook with all extensions temporarily disabled. The only other change to the Exchange Server was a certificate update for II


My computer (running Windows 11 Pro) forced an update about two weeks ago. Since the update, my Outlook will not return to "new" Outlook, it deleted my email signature, and is incredibly delayed in getting messages. I am opening the "classic" Outlook app on my computer because the one labeled new seems to not actually be a functioning app (no icon, nothing happens when I click on it). When the Outlook app opens, I can see the 'Try the new Outlook' toggle. The toggle just turns back off and the app does nothing different. I saw a reply to an issue similar to mine that mentioned going to the Registry Editor and followed instructions outlined in that message but nothing change

Incorrect send/receive intervals often delay inbox updates. Go to File → Options → Advanced → Send/Receive and set automatic send/receive every 5 minutes for best performance. Large mailbox sizes, unstable network connections, and abrupt shutdowns are the leading causes of OST corruption. Microsoft provides a built-in tool called SCANPST.EXE to scan and repair minor OST corruption. Chat with our experts or create a support request now.


When you install Outlook, an Inbox repair tool (scanpst.exe) is also installed on your PC. The Inbox repair tool can resolve problems by scanning your Outlook data files, and repairing errors. To Office 365 sync problems and login fixes use the Inbox repair tool, exit Outlook, and then follow the steps in Repair Outlook Data Files (.pst and .ost). If your antivirus software includes integration with Outlook, you may experience performance issue


It contains settings for desktop backgrounds, screen savers, sound settings, and other features. User profiles help make sure that your personal preferences are used when you log on to Windows. As your mailbox size increases, more resources are required to open each folder. If you have a large number of items in any single folder, you may experience performance issues during certain operations. For more information, see Outlook performance issues when there are too many items or folders in a cached mode .ost or .pst fil


Before finding solutions, we suggest that users check their internet connection. Sometimes, Outlook sync issues can arise because of poor internet connection. If you are still facing this issue, kindly follow the solutions below to fix the sync issues in Outlook. There are various methods to resolve the Outlook sync issues, including manual and third-party solutions. Firstly, we will discuss a few manual methods to resolve this Outlook error and share the stepwise procedure of each method to successfully fix synchronization Office 365 sync problems and login fixes issue


Upgrade to Microsoft Edge to take advantage of the latest features, security updates, and technical support. If you use the cloud-based Microsoft 365 on a PC or Mac, the automated Support and Recovery Assistant tool can diagnose and fix many issues, including Microsoft Outlook not starting. You may have to contact your antivirus software vendor to determine how to configure the software to exclude any integration with Outlook or to exclude scanning in Outlook. For a list of antivirus software vendors, see Consumer antivirus software providers for Window


Unless you manually update your cached credentials, the box will continue to pop up and possibly even lock your account after a few attempts. Follow the instructions below to clear the cached credentials. The stored credentials are not overwritten when Outlook triggers the authentication prompt even if you enable the Remember my credentials option. If your administrator uses the Microsoft Office Group Policy templates, they may configure Outlook not to save Basic Authentication credentials. If they do this, the Remember my credentials option is still available in the password prompt, but has no effect when you enable i