Mailbox quotas and Exchange Unified Messaging

I was wondering about this the other day: what happens when someone attempts to leave a voice mail message on an Exchange 2007 Unified Messaging server when the target mailbox is full?

It turns out that Microsoft helpfully documented this already: if the mailbox is nearly full (such that the VM would make the mailbox go over quota), it's still delivered. If the mailbox is already over quota, the UM server tells the caller that the mailbox is full, and the caller isn't allowed to leave a message. This may be actually useful if you want to create an announcement-only mailbox, but I haven't tested doing so yet to ensure that it behaves as expected.

Technorati Tags: Exchange 2007, Unified Communications, Unified Messaging