Discontinuation of support for Session Border Controllers in Exchange Online Unified Messaging

The message was retracted, and the original recommendations stand.  However, even though this was retracted, be advised that ultimately Exchange Unified Messaging is a dead product based upon very old technologies and will very likely never see new development or updates.  It's not a direction you'd want to head unless you have no other option.  I suppose there's a chance that the vendor products that connect with it will be able to leverage Azure VM in future versions, but that's pure speculation on my part at this point.