[tacticalogic]

The killer app for Linux will be a complete desktop suite including a DB based email server and email client with integrated calendering (Exchange/Outlook).

It's going to have to integrate with the phone system too, if it's going to go toe-to-toe with Exchange.

[GeronL]

It's going to have to integrate with the phone system too

Ubuntu Touch

[taxcontrol]

Good point. I assume that since there is a VOIP PBX for Linux (http://www.asterisk.org/) that integration would not be too hard.