You can connect Mozilla Thunderbird 8.0 to your email account using POP3 or IMAP4 connectivity. These instructions apply to Windows and Mac. Note: This topic applies to Office 365 operated by 21Vianet in China. In this article Set up email using Mozilla Thunderbird 8.0 Find your POP or IMAP server settings What else do I need to know? Set up email using Mozilla Thunderbird 8.0 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: On the Tools menu, click Acco...