• Using AJAX to suppress page reload
• Emulatiing outlook a lot
• Mail will support chinese characters. But Folder list doesn't.
• Contacts will represent all my msn messenger contacts.
• Progressing bar is yellow and sits in lower-left corner (instead of that red bar in upper-right)
• Note the URL mail.start.com (btw, try out www.start.com/3/ )
• For now seems passport has some technical problem, so currently no firefox capatibility result.

In general, reminds me gmail a lot and doesn't have that much function of gmail.

Considering MSFT is an excellent copy cat, I'm waiting to see hotmail playing a bunch of catch-up in the following days.