I've seen it work when people are in groups that shouldn't work, I'm not sure why. The Send As issue is a pain in the ass because sometimes it fixes easily and sometimes Microsoft even has to get involved. Someone could have applied one of the fixes when people are in "Protected" groups, it's in one of the Microsoft KB's. You can make changes to adminSDholder container I think as a work around.
Out of the 20 calls I would answer in a day, at least 5 were Send As. I've even had Microsoft on the line and had to prove that it was no longer a BES issue. Once you've tried all of the fixes from Microsoft and they don't work, they usually run ADSIEdit or DSACLS to correct the issue.
Keep us posted if it worked or not.
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