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1, In Trash, Junk & Inbox the column for "From" is called "series 3."
2, I have unticked any option to use the global address book for auto-completing address but it still searches it.
The From column will eventually come back. I had the same problem when I updated to the latest beta but after a restart or something the column header got fixed and hasn't bothered since.
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Zimbra Desktop B2 (Build 10414) 
Linear Mode
