Didn't Obama insist on having his personal Blackberry instead of a government issued one?
Yep. The Crackberry techies supposedly configured Barry's phone such that it complies with the rules about security and whatever rules there are about keeping copies of stuff he sends out and gets.
Something tells me this is a standard ploy that Congress plays, irrespective of who's in the White House, and the usual method of the White House (or Blair House, for that matter) is to tell Congress to pound sand, that Executive Privilege rules.