The Mac OS X 10.6 Snow Leopard version of Apple Mail has been out for a while. Here's a quick look at what's changed between the 10.5 Leopard version and the Snow Leopard version:

• Mail now natively supports Microsoft Exchange Server 2007.
• You can re-arrange items in the sidebar.
• Performance has been improved significantly, especially when displaying the contents of mailboxes, searching, and moving messages.
• Data detectors can now recognize flight numbers.
• HTML message editing has been improved in several respects.

—Posted by Tonya Engst on January 14, 2010