Having used 3rd. party sync tools in the past with ACT (all the way back to Act 5.0/2000), allowing only the past 30 days of calendar entries to sync with Conenct on ACT 2012 to a mobile device is very, very limiting. Part of the appeal of ACT vs. using Outlook for contact/calendar management, is it's ability to link contacts with ALL activities. When I am visiting a client that I have not seen in a couple of months, it would be great to be able to search my mobile device calendar to pull up when our last meeting was, notes I took and input into that calendar entry, etc.
I understand the concept of not wanting to overload the phones memory, but this feature should at least allow us to select how far back we want to go and use the same yellow and red warnings that we see when we try to sync 1500 or 2500 contacts.