I have the official x64 version 7000 installed on my main system and so far it has been very stable. Apart from a network problem (see else where in this forum) I have been very satisfied with this release. I downloaded the 7057 from the newsgroups today. Now is this a legit release from MS and is it safe to upgrade to? I am in the windows feed back program which is only open to the first 500 aplicants and I don't want to jepodise this by upgrading to 7057 if it is not legit as I will be intitaled to free MS software when the 4 months of feed back is up.