Handle Exchange 2007 mailbox-limits using Powershell and Customattribute15 (ADS)

In my last job, I was responsible for our exchange-environment (Exchange 2007), where we've had a lot of users with HUGE mailboxes. They kept requesting new/adjusted limits all the time, so instead of 'wasting' our 'engineers-time' for all the requests, we've came up with a pretty nice ...