The President of the United States Using a Blackberry

I'm hearing a lot of talk about the President of the United States using a Blackberry. Some are saying that there is a concern that Blackberry servers are in Canada. I agree that U.S. data on foreign servers might be a concern, but are we saying that we trust big corporations with presidential data? With outsourcing, couldn't a US server be in a foreign hosting location? Even if it is in the U.S., I don't trust corporate American to be responsible if they think they can get away with not being responsible and it gets them gain.