Hello, We installed a version Exchange 2000 Enterprise in beta mode and we wish to migrate it towards RTM version. We have only one Exchange 2000 server. As described in article 276206, it is enough to reinstall with RTM product. http://support.microsoft.com/default.aspx? scid=kb;FR;272082 and also http://support.microsoft.com/default.aspx?scid=kb;en- us;276206 Unfortunately the information store shuts down and the following error message is logged in the application event log: Event Type: Error Event Source: MSExchangeIS Event Category: General Event ID: 1182 Description: Thank you for your participation in the Microsoft Exchange Server beta program. Your license to use this beta version of the Microsoft Exchange Server software has expired. Contact Microsoft Corporation. Moreover, after the reinstallation, the Exchange 2000 Setup log file display : [ 14:25:24 ] Information of configuration of the program of installation: [ 14:25:24 ] It is about the version Enterprise de Microsoft Exchange 2000 [ 14:25:24 ] This is a copy of evaluation of Microsoft Exchange 2000; it expires in 120 days. When we try to install or reinstall directly from CD Exchange RTM, a message indicates to us that we cannot install starting from a version different such as described also the newspaper from installation: [ 15:08:04 ] Prerequisites for Services Collaboration and Transport Microsoft Exchange failed: The component "Services Collaboration and Transport Microsoft Exchange" cannot be seen assigned the action "To reinstall" bus: - You must use the same edition of the program of installation of Microsoft Exchange 2000 (Enterprise or Server) that that of the product installed. http://support.microsoft.com/default.aspx?scid=kb;en- us;297057 In the register key we have '52983-....': that's reveal we have a Exchange 2000 Enterprise Edition - Non-eval - French istallation. I hope we should make something else than reinstall the Exchange server on a clean server with all the complications that implies... THANK YOU FOR YOUR ASSISTANCE Roch Moreau.