stop the SQL services associated with MSDE. copy off the MDF/LDF files to a safe location. uninstall MSDE. install SQL. install service packs. create a new BESMgmt (or BESTest) instance from within the BlackBerry software (move its database configuration to a 'new server'), thus creating the system database entries. stop SQL services. copy the newly created SQL MDF/LDF files elsewhere. copy the old ones back over. start SQL services.
...or follow the instructions in the link above, except treat it like one server rather than a remote one. same concept.
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