Originally Posted by Highfall
I know it is a dupe post, but wanted to make sure I posted the new info I have...
We found all our users seeing the issue turned out to be Cingular users. It seems to have worked itself out, so I wonder if they were having issues the last 3 weeks or were merging their billing systems which may have caused issues. They are making the big switch to everything being called ATT and merging systems may have been a part of that. Either way, it looks to be ironing itself out. Are all your users Cingular?
Good that you figured it out, but who'd of thought?
My only suggestion would be to double check that the afflicted users are not part of any AD built-in accounts. Send as permissions don't work on those. But that's all I can contribute. None of my Nextel or t-mobile users have had any problems.