Troubleshooting Office 365 Activation Issues: A Complete Guide Try sign company dallas testing the configuration of your Office 365 email system and fix the problems that are preventing users from using the email services. Microsoft Support and Recovery Assistant can help you resolve problems with Microsoft Office, Office 365, and Outlook. Domain verification issues can also prevent the normal use of the Microsoft Office 365 suite. If you have forgotten your password for the Office 365 account, try to recover or reset the password. 5 Resetting or Reinstalling Office (Approx. 160 words) Keep in mind that the files you delete can temporarily consume storage space. Then try to activate the installed Office 365 suite again on your computer. You may need to remove old Microsoft Office licenses from your computer and install a new one. They can either be simple, like the OneDrive service not running or the missing OneDrive icon on the taskbar, or more complex, like OneDrive conflicting with Microsoft 365. Below we provide a more detailed list of issues and corresponding solutions. The operating system on which your Office 365 applications are installed does not support the updated version of Microsoft Office 365. The good news is that the majority of problems can easily be solved on the client’s side. Reboot your system and try to launch your Outlook app after to check if the synchronization issues are solved. If you use Microsoft Office 365 Outlook as a standalone email client, and you cannot send and receive email messages, check the Outlook connection settings.