The MapPoint web service is pretty flexible, you ought to be able to contruct a secure gateway between the web service and your intranet server if that is allowed.

There's lots of mapping software for web servers which you would host and maintain on your own server, stuff like MapInfo's MapXtreme to Manifold IMS, also I'm sure ESRI has some suitable software. Also, perhaps MapQuest has a server/appliance which you would house, I am not sure.

Eric

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