Nokia Drive 2.0 - Why is Nokia Maps streaming the map data in my Nokia Lumia with Windows Phone 7 even though I have already downloaded the country map with the Drive application?

Nokia Maps on Windows Phone 7 uses a different map data format than Nokia Drive. Therefore, map data downloaded with Nokia Drive is not used by Nokia Maps and has to be streamed on as needed basis.

Note that Nokia Maps, in contrast to Nokia Drive, does not cache the downloaded map data.