First time synching x51v... I have previous files

[philosophy62]

I'm going to do a first synching with my new x51v which I just received today. My issue is that I have an old x5 that I've been synching through activesynch 4.2. How do I proceed? Do I synch first as a guest with the new machine, or do I set up a profile? I take it that v4.2 has made synching of multiple devices much easier. Thing is that I have, for instance, phatnotes installed on the x5, but not on the x51v. Is this going to be an issue? Thanx for your help!