Are you trying delete any messages that are older than a certain amount of time? If so, you could have your admin perform maintenance on your mailbox using GWCheck and expire/reduce messages older than a certain age.
However, using this method there is no way to save certain messages if they are older than the specified amount of time.
On second thought, you could archive the (old) items you want to keep and then have your admin expire/reduce your mailbox. Afterward you could unarchive the messages. That should work.
Hope this helps,
-Ron
We all play from the same deck of cards, it's how we play the hand we are dealt which makes us who we are. -Me
murof siht edisni kcuts m'I - PLEH