Enterprise edition refers to SQL, not to the OS, but I too think that's Server 2008. SQL Enterprise edition only runs on Server 2003 and Server 2008. The editions of SQL that will run on Vista are Standard, Developer, Workgroup, Web and Express
Gail Shaw
Microsoft Certified Master: SQL Server, MVP, M.Sc (Comp Sci)
SQL In The Wild: Discussions on DB performance with occasional diversions into recoverability