This is straight from GFI's web site Does GFI MailEssentials work with Windows 2000 Service Pack 4 (SP4)? -------------------------------------------------------------------------------- The information in this article applies to: GFI MailEssentials for Exchange/SMTP 7 GFI MailEssentials for Exchange/SMTP 8 -------------------------------------------------------------------------------- Article ID: KBID001688 Query keywords: service, windows No - if Windows 2000 Service Pack 4 (SP4) is installed on a machine running GFI MailEssentials, then GFI MailEssentials will not work. However, on the week of 30th. June 2003 we will be uploading a new GFI MailEssentials 8 build that supports SP4. GFI MailEssentials 7 does not support SP4 and if customers want to install SP4, they would then need to upgrade to GFI MailEssentials 8.