A: Possibly, but it is unreliable. Internet activation fails often. Phone activation is being phased out. If your product key is retail and never used on more than 3 PCs, you might succeed.
A: The product key (25 chars) unlocks installation. The confirmation ID (numeric) is given by phone support after you prove ownership. Most people mistakenly call both a "confirmation code." microsoft office 7 confirmation code
To summarize, the term is a ghost. It does not exist in Microsoft's official lexicon. A: Possibly, but it is unreliable