Mobile-review has done a comprehensive review of Windows Mobile 6.0 aka Crossbow Pocket PC OS. Windows Mobile 6.0 is aimed at integrating with the latest Microsoft releases such as Windows Vista, Outlook 2007 and Exchange 2007.

Here are some of the major changes/features introduced:

-New icons, sound themes
-Built in IP telephony: VOIP,SIP
-Smart Dial 2.0: Search as you type through contacts and call history
-Assign ringtones to any event, eg SMS
-Support for HTML messages in Outlook Mobile (till Magneto it is text only)
-Smart Filter ? Search as you type through email messages/SMS in Pocket Outlook
-Support for Exchange 2007 features such as searching and viewing emails on the server itself, downloading Sharepoint attachments, flagging emails, etc
-Integration with Windows Live online-services
-Windows Mobile Update: Live Search Mobile, Live Mail Mobile, Live Messenger Mobile
-Memory card encryption