I never use anything by Google as I do not like how they handle their user data so cavalierly.  In any event, If moving the Yahoo mail data to a Google Groups platform would make it easy for the development team than I would see this as an appropriate solution.

However for the type of technical support and discussion that is going on within this area, I would prefer to see a technical forum implemented where it is easier to catalog and search through various topic threads for answers to questions that have posted solutions while allowing everyone to initiate new threads of discussion for new issues that arise.

ProBoards has a free version of their forums, which looks quite good for this type of discussion...

Just my 2cents... 

Steve Naidamast

Sr. Software Engineer