Outlook is just a local client and afaik doesn't support syncing natively, apart from calendar and contacts. I'm not sure what you are trying to do; I guess you want to be able to open Outlook on any of the computers and see all the same stuff, but Microsoft wants you to buy Exchange Server for that.
There are work around with 3rd party software http://www.guardian.co.uk/technology/askjack/2011/jun/30/ask-jack-synchronise-outlook-two-computers
You'd think that you could just set up the .pst file on the server and all the clients use the same file, but it is not so simple
http://support.microsoft.com/kb/297019 (Microsoft want you to buy Exchange server after all, so it is not in their interest to make syncing easy)
If you get any better ideas or find a solution elsewhere, please take the time to post back. Cheers
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------
For the sake of your own health and sanity, if your data is important to you, keep a second copy on another storage (a backup)
