We need to support for WM5.0 as WM5.0 devices are now shipping. The installer does not work w/ the newer Active Sync 4.0. I've heard some reports of minior success of minimo on a Axim x51v (WM5). Apparently the application ran for a short time before crashing. Info can be found in the device matrix and in this thread: http://forums.mozillazine.org/viewtopic.php?t=319888&postdays=0&postorder=asc&postsperpage=15&start=30
Fixed in 010.