Alright so this is my new post...i hope this clears it up
I am looking for Any alternatives to Exchange Server 2007 and what you think about them
If you could help me by telling a little bit about the software that you suggest that would be great. (and guide me with where to find it and if it's free or how much it costs)
You can run Linux in Microsoft Virtual PC, so, you can use Microsoft Exchange, Windows, and Mac OS X (if running Windows in boot camp), but sync among PS i think isn't possible using Linux.
Are you wanting it for email? I use www.mailstreet.com for the last 9 months and LOVE IT!!! So much easier then doing it myself. It starts out at $9.95 a month, but I use 1000mb at $18.95 a month.
If you sign up use my code of 2395. Thanks
Other Big alternatives are IBM Lotus and Novell related products. Those are not free but they provide similar collaborative effects like Exchange server. They are more for business than anything else
Here's a list of software you can look on your own.