Mozilla Thunderbird

Thunderbird is a popular open-source email client from Mozilla, authors of the Firefox web browser. It is available for Windows, Linux, and Mac OS X.

Mozilla Thunderbird can be used with the following Gradwell email products:

• Email Standard mailboxes via either POP3 or IMAP.

Mozilla Thunderbird can be used with the following Gradwell email products, but doesn't support all of the advanced features of these products:

• Exchange Advanced or Zimbra Premier mailboxes¹⁾ via IMAP. Thunderbird does not support Exchange's shared calendar or shared documents features. We recommend using Microsoft Outlook with Microsoft Exchange.
• Zimbra Advanced or Zimbra Premier mailboxes²⁾ via IMAP. Thunderbird does not support Zimbra's shared calendar or shared documents features. You can use Mozilla's Lightning and Sunbird calendar tools instead, or Zimbra's built-in webmail support.