I can't sign in to my Outlook desktop app
If you purchased a Microsoft 365 Business Professional plan or greater and can’t sign in to your Outlook desktop app, try the following solutions. If you have a different plan type, see this article for help signing in.
Note: In the meantime, you can sign in to Office online or Outlook on the web.
Check if you have the latest version of Outlook
- If you're having trouble signing in to your Outlook account, check what version of Outlook you've installed on your desktop.
- If you have an older version of Outlook, uninstall the outdated version. Read how to uninstall Office on a PC or how to uninstall Office on a Mac for additional info.
- Install the latest version of Outlook through your Email & Office Dashboard.
Sign in to Outlook
Once you have the latest version of Outlook installed, sign in using the email address and password associated with your Microsoft 365 Business Professional plan.
- Go to File, then Office Account.
- Under User Information, sign out of your previous Outlook account and sign in with your new account:
- Select Sign out if you want to remove an existing Outlook account and sign in to your Microsoft 365 Business Professional account.
- Select Switch account if you want to keep an existing Outlook account and sign in to your Microsoft 365 Business Professional account.
Both options will also connect you to OneDrive and SharePoint.
Activate Microsoft 365 Business Professional
Activate your Microsoft 365 Business Professional plan by applying your license.
- Go to File, then Office Account.
- To activate Microsoft 365 with a different account: Select Change License and follow the prompts to sign in with your email address and password.
- To manage your devices: Select Manage Account, sign in with your email address and password, and select Devices. You'll see where you've actived Office using that email address, and can disable any devices you no longer own. (Learn more from Microsoft.)
Warning: If you cancel your Business Professional plan, your Outlook will be set to read-only after 30 days.
