We are currently in a "legal hold" status with the GW system, meaning
we cannot run any kind of expire/reduce options on a system wide
basis. Needless to say the user mailboxes have grown exponentially.
Mostly, I am concerned with the user DB sizes.

I am curious when I should become alarmed, meaning, at what size would
system/mailbox stability become an issue.

We have no idea when we will be relieved of the hold status and I am
looking for any suggestions on how best to manage the system going

Any advice would be appreciated.