how to increase rules quota for exchange 2007 user

In exchange 2007, the rules limit is higher than exchange 2003. It defaults to 64KB

 

To increase this limit for a mailbox user, use this powershell command:

 

Set-Mailbox username -RulesQuota:256KB

 

256KB is an example. Remember that setting limit too high will increase memory requirments of this mailbox