I wonder if there's an option to configure BES4 to wirelessly synchronize only 2 months forward.

I love wireless synchronizing too of BES4 and OS4 -- Anything that I add to Microsoft Outlook automatically shows up on my BlackBerry Calendar/Addressbook/etc about 5 seconds later. And vice-versa, anything I add to my BlackBerry shows up in my Outlook automatically within 30 seconds. It's continuous synchronization.