It is recommended that both servers (Principal and Mirroring) have the same version/edition. People consider mirroring ss2005 to ss2008 in case of upgrading (one way ticket) as you cannot downgrade from ss2008 to ss2005Best Regards, Uri Dimant SQL Server MVP http://dimantdatabasesolutions.blogspot.com/ http://sqlblog.com/blogs/uri_dimant/
Proposed As Answer byPrinceLuciferMVPMonday, December 12, 2011 6:28 AM
To complete the picture Uri has already outlined: Mirroring is supported between all version starting from SQL2005 up to SQL2012. But only as long as the mirror is same or newer as the principal...
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