Regarding MS Mappoint. Why are you interested in it? We aim to support many map formats, and have powerful means of creating plugins (that also 3rd parties can use).
But, I haven't been able to find any means/information of using Mappoint in a "modern" way since it isn't tile-based like basically all other web maps. Thus it would require significantly more development to "squeeze" into GGS/VT.
If you are only looking for low-price maps(?) have you investigated the OpenStreetMap alternative?
See this plugin for example: http://franson.com/forum/topic.asp?TOPIC_ID=10648
There might also be other local map provider alternatives that are cheaper.
Thanks for your feedback, we listen!