I have been using my 940 for some time now. I know that there is an issue with using prontoedit ver 405. This does not allow CCFs to be downloaded to the 940. (It is a specific bug that does not affect other prontos). To my knowledge this bug has not yet been fixed. I am therefore still using PE 105. However, I recall reading some time back that some pronto models and/or versions of prontoedit are not compatible with windows XP. I am using ME and want to upgrade to XP but am concerned that this may mess up pronto edit. I haven't had any useful input from the remotecentral forum. Can anyone here enlighten me?