In the previous versions of Exchange Server we cannot play with the mailbox rules limit that is only 32kb (http://support.microsoft.com/kb/886616). Using Exchange Server 2007 we can do that through Exchange Management Shell. Let’s see how to do that..
The cmdlet utilized to set up the mailbox is called set-mailbox:
Set-Mailbox <mailbox> -RulesQuota:<size>
Let’s change the user Alexandre to 256KB limit using set-mailbox, and after that let’s visualize the changes, as it follows:
Ps.: This value is only for enabled rules, the disabled rules are not included in the amount of rules data.