1.     Open Fax Voip T.38 Modem Control Panel. Click E-mail in TreeView, then click SMTP. On the SMTP settings page, select the Enable OAuth 2.0 Modern Authentication checkbox.

2.     Click E-mail in TreeView, then click POP3/IMAP. On the POP3/IMAP settings page, select the Enable OAuth 2.0 Modern Authentication checkbox.

3.     Click E-mail in TreeView, then click SMTP, then click OAuth 2.0. On the OAuth 2.0 Settings (SMTP) page, select Use this OAuth 2.0 configuration for POP3 / IMAP checkbox. Select Microsoft / Office 365 / Hotmail / Outlook.com (Thunderbird) or Microsoft / Office 365 / Hotmail / Outlook.com (MS Oauth Test) from the drop-down list, and then click <Load Profile> button.

4.     In the E-mail Address text box, enter e-mail address associated with your Microsoft account. In the Open authorization request in this browser area, select either WebBrowser (.Net) or Internet Explorer. If Microsoft / Office 365 / Hotmail / Outlook.com (MS Oauth Test) was selected, you can also select Default Browser. Click <Get Refresh Token> button.

5.     In the web browser window, enter your password and click Sign in.

6.     On the next page, click Yes to confirm the requested access to your Microsoft account mailbox.

7.     If Default Browser option was selected, close the web browser window manually.

8.     Make sure the Refresh Token has been generated successfully. Click <Apply> button to save your settings and Refresh Token.

9.     Click E-mail in TreeView, then click POP3/IMAP, then click OAuth 2.0. To use 2 different e-mail accounts for outgoing and incoming e-mail messages, uncheck the Use OAuth 2.0 settings configured for SMTP checkbox, and then repeat steps 3-8 for OAuth 2.0 Settings (POP3 / IMAP).

10.     Click E-mail in TreeView, then click SMTP. Make sure the following settings are configured:

Enable OAuth 2.0 Modern Authentication: YES

Send e-mail method: SecureSmtpClient

Sender's e-mail address: the e-mail address associated with your Microsoft account

SMTP Server: outlook.office365.com

Port: 587

My server requires a secure connection (SSL): YES

SSL Mode: Explicit (STARTTLS)

My server requires authentication: YES

Login: the e-mail address associated with your Microsoft account

Click <Test> button to send test e-mail message, see also Testing e-mail sending.

11.      Click E-mail in TreeView, then click POP3/IMAP. Make sure the following settings are configured (POP3):

Enable OAuth 2.0 Modern Authentication: YES

Account type: POP3

Incoming Mail Server: outlook.office365.com

Port: 995

My server requires a secure connection (SSL): YES

Login: the e-mail address associated with your Microsoft account

Click <Test> button to test POP3 connection, see also Testing POP3 / IMAP Settings.

12.      To use IMAP protocol to receive e-mail messages, use the following settings:

Enable OAuth 2.0 Modern Authentication: YES

Account type: IMAP

Incoming Mail Server: outlook.office365.com

Port: 993

My server requires a secure connection (SSL): YES

Login: the e-mail address associated with your Microsoft account

Click <Test> button to test IMAP connection, see also Testing POP3 / IMAP Settings.

Notes

• The Microsoft / Office 365 / Hotmail / Outlook.com (Thunderbird) profile uses Client ID imported from the Mozilla Thunderbird e-mail client (the source codes are available at this page). The Microsoft / Office 365 / Hotmail / Outlook.com (MS Oauth Test) profile uses Client ID we found on the EmailArchitect website. Alternatively, you can create your own 'OAuth 2.0 Application', see instructions on the Microsoft website.

• Note that sending e-mail messages via SMTP using OAuth 2.0 or receiving e-mail messages via POP3 using OAuth 2.0 sometimes may not work. The problem is presumably on Microsoft side and depends on the type of Microsoft account (Office 365, Microsoft Exchange, Hotmail / Outlook.com) and its settings. On the one hand, Microsoft constantly warns about disabling Basic authentication for Office 365 and Exchange Online users: Deprecation of Basic authentication in Exchange Online. On the other hand, something may not work and the problem persists for several days, weeks or even months. Our latest tests with a regular Microsoft account (Hotmail / Outlook.com) show that everything (IMAP, POP3 and SMTP connection using OAuth 2.0) works as expected (June 2023). However, based on the above, for most Microsoft accounts it seems currently reasonable to use Basic authentication.