Personely I would not bother upgrading it old bes install.
Stop and set old bes services on manual.
Follow all pre-requisites prior to install of the new BES.
Logon as current BESAdmin acct.
Install new and latest version BES server 4.1.5 and point to a same sql database. Upgrade database when prompted.
Make sure Blackbery Server (not windows server name) name is the same as old one. (that is important.)
Finish install and start services and test it. At this point do not attempt to start old BES services.
Once you are sure all is good, uninstall old bes from exchange. Life is good again.
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