We run exchange 2003. We have a lot of issues with people pulling their work email into their personal blackberry's. I know it is convinient but being a school system their are a lot of legal issues that could happen with lost student information. If you disable OMA for a particular user in AD does that prevent a person from getting email to a mobile device?
unfortuantely we do not have a specific policy about getting email to your personal Blackberry.