We migrated to 365 from old IMAP server a week ago. Migration was fine, but one day all folders expect Inbox was disappeared. Restored about 10 folders with 7 GB data with PST export/import from old mail server. All was fine about 1 day, but now, all subfolders of Inbox was Disappeared. MS Support is analyzing the catastrophe. We have 5 Mac Outlook 2011 clients about 10 Win Outlook 2010 clients and 2 Win Outlook 2007 clients. And what is interesting: Same users had also another shared mailbox with no problems (anyway I think they don't use that so much).
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