How to Upgrade to OAuth2 Security for Existing Office 365 Accounts


Office365 IMAP and SMTP servers support authorization via the OAuth 2.0 protocol, which Postbox also supports. If you're receiving notifications about using a less secure application or simply want to use the latest and greatest security protocol, try upgrading your Postbox Office365 account to OAuth2. It's quick and easy to do!

  1. Within Postbox, navigate to Options | Preferences > Privacy and then select the checkbox for "Accept cookies from sites."
  2. Navigate to Options | Preferences > Security > Passwords > Saved Passwords and click the "Show Passwords" button. Take a screenshot of your passwords so you have them as a backup.
  3. Remove all of your Office365 passwords from the Password Manager, then close the window.
  4. Navigate to Options | Preferences > Accounts. Select the Office365 account and change Authentication to "OAuth2 (Office365)." Repeat this step for each of your Office365 accounts.
  5. Navigate to Options | Preferences > Accounts > account list on the left > Outgoing Servers. Here, you will want to edit each Office365 server and change Authentication to "OAuth2 (Office365)."
  6. Once complete, restart Postbox, and it will authenticate with each of your Office365 accounts.
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