Ryan pinged me because he was getting this error on a test Exchange 2007 VM today. I hadn’t seen it before, but asking some smart friends quickly produced a reasonable answer: this is the message an Exchange edge or hub transport server produces when it’s low on RAM or disk space. How low? You’ll get this if you have less than 4GB free on the queue volume. That seems like a lot, but given how large disks on transport servers are likely to be, it’s probably reasonable. Anyway, freeing up more space on the queue volume solved the problem, so I’m blogging it for the next person who runs into the same error.
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