Check in the Manifold forum (if no one else, Dmitri will respond

I haven't seen any discussion in here regarding linking up Manifold and MapPoint, but I'm sure it's easier than linking MapInfo or ArcView and MapPoint and/or cheaper than using the Map-In-A-Box to tie those products into MapPoint.
Note that's it's not necessary to use Manifold (or Map-In-A-Box) to do geocoding with MapPoint, you can do it for free with Gilles unsupported Pins2File or CalcPos routine if you have some programming skills ( there are several utilities and articles that have links for geocoding to Excel and Access on this site) or the $75 Pushpin Tool, I'm sure there are more.
HTH,
Eric