Scheduled full scans

Hi,

due to security risks I choose a antivirus product for exchange.
The problem is that on a new e2k7 platform the scheduled full scan isnt available anymore.

So there is now way to be sure that all stored objects where scanned using the current pattern.
In some cases it is helpful only scan the objects of the last week, but in the past we all learned that in some cases a fullscan is necessary, due to changed patterns and so on.

Due to a performance issue I think first of all there is the database size of exchange wich could be very helpful, so that this issue shouldnt be a problem when it is scheduled in a hour when less performance is needed.

thank you