If you need a Linux advanced messaging and calendaring software then Scalix 11 might be the right solution for you.

Scalix 11 pre-release version is available for download (for evaluation purpose only). The production release will be offered in November.

They offer packages for RedHat , Suse and Debian (works on Ubuntu)

Scalix offers both free and commercial lines of their product. It depends on your needs and whether you need support or not.

Here is a summary of their features:

• Full-featured email and calendar server
• AJAX based web client for accessing both email and calendar
• Connectivity support for Outlook and Evolution
• Mobile client access for advanced wireless email and PIM support
• Web services programming interfaces which makes it easier for developers to integrate the product with other applications.

I will be installing and evaluating this software… It seems like Ximda mail is about to find a new home.