- Email: communicating with people
- Email attachments: sharing files
- Address Book: storing contact info for friends, coworkers, and acquaintances
- Calendar: keeping track of events you've promised to attend
- RSS feeds: keeping up on news that you're interested in
What're the problems that FaceBook solves?
- Messages, Wall, Notes, & Chat: communicating with people
- Photo & video sharing: sharing files
- Profiles: storing contact info for friends, classmates, and acquaintances
- Events: keeping track of events you've promised to attend
- Newsfeed & shared links: keeping up on news that you're interested in
That's why Microsoft is scared. ;-) The market is different, but the tasks are exactly the same - and as FaceBook users get older, they become the market that previously used Outlook.