Still waiting for additional regions to be compiled, just wanted to post just to let you know we've not forgotten.
If you're trying to put old maps into a newer version or use new maps in an older version of Navmii you will find the application crashes.
Each time we change something about the map data format the application is changed to take account of this and recently a change was made that mean't older map data became incompatible with the new version.
1.2.663 was the switchover.
Map data is from TeleAtlas presently although the engine was written using Navteq data. We support both but we currently have no agreement with Navteq
Also you've probably ascertained ths yourselves but...
The activation keys tie the hardware to a map region, an activation key XXX.key should always be valid on that particular hardware platform (unless the deviceID that Navmii reports changes)
Once you have a working key it will aways be valid on that platform regardless of map data changes.
Regarding POI, these are currently compiled in with the map data. Although I think this will change soon when we introduce POI import facilities.