I am ready to upgrade my 64-bit Home Premium installation to Pro and wondering if it's worth to spend the extra bucs to upgrade to Ultimate instead, just so I also get the Bitlocker encryption. Or ... I could spend the extra bucs later for a 3rd party encryption software that also integrates transparently with Win7. When I worked at my previous employer, we used to have such a 3rd party encryption software on our company laptops that once installed, were virtually transparent to use; once you logged into your Windows account, that username & password was automatically used by the encryption software as well. You could designate individual folders for encryption (such as "MyDocuments",) not just the entire HD. I wish I remembered what the software's name was, though it may not have been available for retail customers. I wonder if Bitlocker is also as easy to use and if it has a folder-only encryption option. I tried TrueCrypt ones, but I did find it very convenient to use and I could not figure out how to encrypt existing folders with it.