there are numerous places in the MS literature that make reference to this but my experience is from direct phone Conversation with MS while trying to get my Server working well over a year ago
the link to the MSExchange forum was the first link I came to

my only reason for posting is that I know for sure that with a previous device I couldn't get autd to work with a Wi Fi connection only and this was confirmed adamantly by MS tech Support over the phone

I'm glad it is working for others