Maximum E2K7 Transport Rules
A couple of people have asked me how many Tranport Rules can be created in Exchange 2007. You can have a maximum of 1,000 rules. These are processed for EACH message that crosses through the Hub Transport server (and that would be ALL messages). They should be kept in RAM on that server. The more rules and the more messages that pass through the Hub Transport server role, the more RAM you should have and the beefier the Hub Transport servers should be.