Something that I had a LOT of trouble finding, was a way to keep my Outlook PST files synched between my new laptop, which I use away from home, and my desktop machine which I use most of the time.
If you don’t use Exchange, Microsoft does not seem to have any answers for you, which seems ridiculous as there are many people now in the same situation.
Then I stumbled across SynchPST, a program that does exactly what I need and at a reasonable cost. The “basic” version synchs all the bits that you would care about in your PST file – email, calendar items, tasks and contacts with no fussing about.