Use the Excel check troubleshooter to resolve Excel for Windows startup, hang, or crash issues. Get Help has troubleshooters for Microsoft 365 you can run for many common scenarios. These often help resolve issues without the need to contact support. If a troubleshooter is available for your issue, select Start to run that troubleshooter.

Microsoft 365 uninstall troubleshooter

If you find this CNAME record, delete it, and wait for DNS replication to update the DNS record. Microsoft 365 Apps fails to activate when opened from published apps on a Citrix server. For more information, see Known issues (Citrix product documentation). For troubleshooting steps, Help from FixTechGuide see Office for Mac repeatedly requesting keychain access. Use the Microsoft 365 activation troubleshooter to resolve Microsoft 365 subscription activation issues.

How can I fix Microsoft 365 installation error codes?

If you’re unable to sign in to your Microsoft 365 account, ensure you’re using the correct email and password. Locked accounts, due to multiple failed attempts, may require waiting or following unlock instructions. Check your internet connection, as weak connectivity can cause issues. For work or school accounts, confirm with your organization that your account is active. Browser or app issues, like outdated software or cached data, can also interfere; try clearing your cache or switching browsers.

• Check your software's documentation for instructions or ask your administrator to do this for you.
• Get Help has troubleshooters for Microsoft 365 you can run for many common scenarios.
• If you connect through a Virtual Private Network (VPN), you might need to temporarily disable your VPN also.
• For work or school accounts, confirm with your organization that your account is active.
• You can also allow Microsoft 365 to bypass the proxy server by creating a PAC file.
• If we detect a problem with your account, we'll tell you what you need to do to solve the problem.
• For more information, see Known issues (Citrix product documentation).
• Use the Microsoft 365 activation troubleshooter to resolve Microsoft 365 subscription activation issues.

Lost access to your account

Close other programs or downloads running on your device to free up resources. If you’re still stuck, reboot your computer and try the installation again, preferably during off-peak internet hours. Microsoft 365 is a vital tool for many businesses, and login issues can significantly disrupt day-to-day operations. In this guide, we will take an in-depth look at troubleshooting and resolving common Microsoft 365 login problems so you can keep your business running smoothly. Slow performance can be due to heavy CPU usage or low available memory. Close unused tabs, background processes, or applications to free up system resources.

Additional resources

Use the Microsoft 365 sign-in troubleshooter to help resolve sign-in issues encountered with Microsoft 365. Each firewall will have a different method to enable access to these URIs. Check your software's documentation for instructions or ask your administrator to do this for you. For more information, see Disabling ADAL or WAM not recommended for fixing Microsoft 365 sign-in or activation issues. Upgrade to Microsoft Edge to take advantage of the latest features, security updates, and technical support.

What can I do if I experience issues syncing emails in Outlook?

Reinstall the app if problems persist using Microsoft’s compatibility manuals. Slow-loading apps may indicate excessive add-ins or cache issues. Open apps in Safe Mode to bypass add-ins and check for improvements. Reduce startup files or clear Office’s temporary cache as needed.