The Zimbra Ajax Toolkit :

Zimbra is contributing to the Open Ajax Initiative by providing open access to the Zimbra Ajax Toolkit (AjaxTK).

Zimbra has used AjaxTK to push the envelope of what we think of as a Web page by developing a complete online Collaboration Suite, including enterprise-class e-mail, calendar, and contacts.

The AjaxTK squeezes the responsiveness gap between a Web-based application and a standard desktop-based application to near zero.

Dojo Documentation URL info. :

http://files.zimbra.com/website/docs/Zimbra%20AJAX%20TK%20Whitepaper.pdf