For vmail, the old trick might work -- call your Z10 number from a different line, don't answer and leave a message. Then retrieve/delete the message on the Z10. Sometimes that kicks the carrier notification system and clears things up.
As for your email timestamp issue...if you mean the sending timestamp, no news there...but we are all hopeful regarding future OS updates.
Occam's Razor nearly always applies when troubleshooting technology issues!
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