O365 IMAP account on Thunderbird

Modified on Mon, 23 Nov, 2020 at 10:48 AM

IMP NOTE: Thunderbird supports the internet standard access methods POP3 and IMAP4. Thunderbird does NOT support Microsoft's proprietary protocols to access Exchange servers or Office 365.

Open Mozilla Thunderbird. The Mail Account Setup dialog box will open the first time that you open Thunderbird. If the Mail Account Setup dialog box doesn't open, do the following:
1. On the Tools menu, click Account Settings.
2. On the Account Settings page, under Account Actions, click Add Mail Account.
In the Mail Account Setup dialog box, do the following:
1. In the Your Name box, enter the name that you want to appear on the "From" line in your outgoing messages.
2. In the Email Address box, enter your email address.
3. In the Password box, enter your password. Click Continue if you're using a Windows computer or click Next if you're using a Mac. Thunderbird will try to find the settings you need to configure for your account.

Click MANUAL CONFIG, or wait for Thunderbird to try to find your account settings.
The IMAP check box, next to Incoming, is selected by default and is recommended. In the Server hostname box, enter the name of your incoming server. If you’re connecting to your Microsoft 365 email, the IMAP or POP server name is outlook.ofifce365.com.
Note: Leave the Port option set to 993. Leave the SSL and Authentication options set to SSL/TLS and Normal Password
In the Server hostname text box, next to Outgoing, enter your SMTP server name. If you’re connecting to your Microsoft 365 email, the SMTP server name is smtp.office365.com.
Note: Leave the Port option set to 587. Leave the SSL and Authentication options set to STARTTLS and Normal Password
In the Username box, type your complete email address. For example, tonysmith@contoso.cn.
Click the Re-test button. If you see the message "The following settings were found by probing the given server,” click Create Account. A page opens that lets you view or change other Thunderbird settings.