There is a interesting poll, (well, for me at least), over on the Sugar site about which email client to integrate with Sugar to replace their dire attempt at an email module.

Zimbra has a few votes but a lot of people are saying it isn't suitable for integration.

As I have posted before I would love to see some kind of integration with Sugar, even on the simplest level of just allowing Zimbra access to Sugar Contacts module to send emails to those Contacts through Zimbra.

Unfortunately, this now seems to have been put on the back-burner here at Zimbra.