Nothing suspicious about this at all

Almost 90 White House officials have maintained private e-mail accounts on the server of the Republican National Committee, including top advisers such as Karl Rove and former White House Chief of Staff Andrew H. Card, according to a House committee report released today. The disclosure means the practice is much more common than Bush administration officials have previously acknowledged, the report noted.
-Washington Post

I'm sure it was only done so as not to overload the government computers. Not to skirt the law requiring all White House emails to be preserved, or anything like that. Nah.