Troubleshoot signing in to Outlook

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Use the following information if you purchased the Microsoft 365 Business Premium plan and can’t sign in to your Outlook desktop app.

 Note: In the meantime, you can sign in to Office online or

Check if you have the latest version of Outlook

  1. If you’re having trouble signing in to your Outlook account, check what version of Outlook you’ve installed on your desktop.
  2. If you have an older version of Outlook, uninstall the outdated version.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.
  3. Install the latest version of Outlook through your Email & Office dashboard.

Sign in to your Outlook account

Once you have the latest version of Outlook installed, sign in using the email address and password associated with your Microsoft 365 Business Premium plan.

  1. Go to File > Office Account.
  2. 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 Premium Account.
    • Select Switch account if you want to keep an existing Outlook account and sign in to your Microsoft 365 Business Premium account.

Both options will connect you to your new OneDrive or SharePoint.

Activate Microsoft 365 Business Premium

Activate your Microsoft 365 Business Premium plan by applying your license.

  1. Go to File > Office Account.
  2. Under Product Information, select Change License to activate Microsoft 365 under a different account.
  3. Select Manage Account to manage your Microsoft app installs by signing in to the web interface.

Warning: If you cancel your Business Premium subscription, your Outlook will be set to read-only after 30 days.

More info

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