attempting to install ESET mail security for exchange on windows SBS 2008 produces the following error "This product version is not compatible with the installed version. It is therefore not possible to run the reinstallation. Please uninstall current product version and restart the installation." I have never installed ESET mail security before, and it definitely is not installed on this server. ESET file security is currently installed, as well as remote administrator server and console. How can I get mail security installed as well?