I've not seen anybody's postings go missing, the conversation threads on are intact on my end. I use fastmail.fm for my mail. Thought I'd better post one just to make sure I can.
I wonder if this has something to do with Google (God-gull) and their recent reign of terror on Microsoft:
http://www.osnews.com/story/26669/Google_blocks_Windows_Phone_from_Maps_limi...
-Daryl