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Microsoft is showing off a Technical Preview of Windows Phone 7.5 Mango and most of the pieces are up and running successfully, including Facebook chat, linked inboxes, podcast support, multi-tasking, and much more.
Check out my full article detailing the improvements and new features in Mango on my ZDNet Smartphones & Cell Phones blog.
Groups let you place multiple contacts under one icon on the Start screen with Live tiles one level below the main Live tile. Family, friends, and coworker groups are good places to start with.
Photos of your group members are easily accessed by swiping to the left.