Support for Outlook/Microsoft OAUTH2 accounts. That would be email addresses ending with @msn.com, @hotmail.com, @live.com, @outlook.com (and the national domains like @outlook.it, @outlook.de, @outlook.fr etc.) and also GoDaddy custom domain (your own domain) email accounts which use Azure AD (Outlook / Office 365) as their backend. Perhaps some other provider as well, but we know of GoDaddy for sure that it uses this as their backend.
Note, you can't convert an existing account into OAUTH2 account. You have to create a new one from scratch. The process is described below.
Bug fixes
Font size when printing message headers (To/Cc/Bcc/Subject/Date) in the "Print" / "Print Preview" was too tiny when a system was set for a high DPI (like 150% or 200%).
To use Microsoft OAUTH2 account use the following steps:
Ensure you have the latest version installed first.
From the main menu choose "Tools" and then "Accounts"
Click "Add..." button
Select the "Google" account icon or "Outlook/Microsoft" account icon, depending on your email account provider (see this post's screenshot).
Select the account type - you can use IMAP or POP account (IMAP syncs emails to multiple devices, POP downloads usually to a single computer). Click the "Next" button to continue.
If there is a firewall popup at this point, be aware that OE Classic needs to be allowed to listen to authorization from Google/Microsoft so please ensure OE Classic is allowed through the firewall. For built-in Windows Firewall there should be no popup, as OE Classic should be pre-approved, this only applies to third party firewall programs or antiviruses.
Now, OE Classic will open your default web browser and you need to log in using your web browser. The authorization must be done from your web browser, as that is how it is designed. For Microsoft you only need to click "Yes" to approve OE Classic. For Google - you must check all the checkboxes offered to give OE Classic permission to access your email account, otherwise you will get an error in OE Classic and you won't be able to add the account. Therefore, check all the checkboxes to give full access to OE Classic before you click "Continue".
You should now get a message that OE Classic is approved, and you can return back to OE Classic and click "Finish" button to close the account wizard and add a new account.
OE Classic is now authorized to use your account, you can start sending and receiving emails right away.