Hmm... I'm a big fan of fixed-budget or prepaid services, but between network, storage, VM costs, etc., what should the provider stop serving if you exceed the spend? Create an outage for your whole service? Throttle egress? Start randomly killing VMs?
I think for their hard limit on MSDN funds, MS shuts down everything that creates incremental costs. As far as i know they don't delete anything, even things like storage that have an associated cost.
That said, i am pretty sure the the TOS for MSDN funds say they are not be used for production systems.
