“ Originally Posted by Will7272 
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Ah, the missing link! Thanks, Will7272. I had no problem installing the latest Garmin Mobile XT (v4.20.20wp), but thought that your two RAR files would provide me with the detailed US maps I had (incorrectly?) presumed to be missing. The above jinxinlove link doesn't shed any light as to what to do with the Mapsource you provided (and I successfully installed onto my PC). How do I get it to my phones card? BTW, jinx' files are of an older version of the Garmin Mobile XT software.