Can Messagestats Report Pack for Sendmail and Postfix be installed on a Windows 2008/R2 Server?
Messagestats Report Pack for Sendmail and Postfix 1.1.1 release notes state that only Windows Server 2003 is supported.
Microsoft changed the way Windows Server 2008 handles timezones. Messagestats RP for Sendmail and Postfix cannot be installed on Windows 2008 Server because of these changes. The only workaround is to install the Report Pack on Windows 2003 server as per the release notes.
Enhancement request TF00152311 logged for this.