I initially started syncing my BB 7100 with my office pc, but I also want to sync with my mac at home. I know I need pocketmac, but can I sync across both OSs?
on the pc, its using MS Outlook's Contacts and its Calender.
Would I need Office on my mac?
I can check my office mail from home, can i sync then?

I do just that, sync with a PC at work and my Mac at home. Office for the is not a must, in fact I find syncing with Address Book and iCal to be much better but some do prefer the all in one aspect of M$ Entourage. My sig. offers some further info.