My ms office 2007 won't start due to activation error

[Ardashe]

I’m currently working on an important project and was about to open Excel to finalize everything. However, when I tried to launch the program, a message popped up saying that it’s not activated. The thing is, I’m pretty sure I had a license key for Office, but now I can’t seem to find it anywhere. I’ve checked my email, old documents, and even the box (if I ever kept it), but no luck so far. 

Edited 20 hours ago by Ardashe

[Mirei]

When this happened to me, I checked my email for the receipt from the first purchase of Office - it turned out that the license key was included in that email. If you can't recover the key, some people suggest trying a ms office 2007 activator as a temporary solution to the problem or another option, signing up for a free trial of Office 365 to buy time to complete your project and solve the activation problem.