We have scaled up the great resource previously called Managed Newsgroups. Now called Partner Online Technical Communities we have a number of community- and product-focussed newsgroups, monitored and supported by Microsoft support professionals.
Start here: https://partner.microsoft.com/global/40014662
There are communities for the following:
See the link above for how to get started. To whet your appetite, here are the sub communities in the item called 'Online Technical Communities for All Partner Levels' - I checked a few of them and they are already quite active and Microsoft engineers are active in supporting partners with technical enquiries.