I am looking at updating my Vista images to SP2 today. I have existing WIM files I use for my deployments using MDT.

I was wondering, can I service these images offline. Meaning, can I add Vista SP2 to my WIM file without having to boot them, add the service pack and then re-sysprep and capture the image file.

 The answer is no according to TechNet. Their instructions is to bring the WIM file online. Then install Windows Vista SP2. Finally, sysprep the image again and recapture. Once the image is recaptured, re-import the image into MDT.

The full instructions for installing SP2 for Vista can be found on TechNet at http://technet.microsoft.com/en-us/library/dd335037.aspx#Scen4

I was really hoping for an offline method for updating, but this will give me a chance to freshen the image as well with newer versions of some of the other applications.