Members, there is a quick and dirty fix if your count of PMs Left is incorrect.
It is available
here. The count will still desync (I am leaving IP's message center code alone for the most part, so that he may fix it). But for the "I deleted everything and I'm still out of space!" crowd, this will certainly help you.

Let me show you how to hump without making love.
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Relatively ancient and inactive
Oh, well. Time to change my signature.
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LOL! I like how it IP does his math... "PMs left calculated and updated to 100." MOOSE SAVES TEH DAIY!
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Haha, mostly the counter is 1 off.
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Yeah, if you only delete 1 PM, it'll be one off.