Lost Windows Activation Code

Somehow in the process of setting up my new computer and migrating files I lost Windows which was installed into Parallels. No big deal, since I have the disk. Unfortunately, the activation code is not printed on the box it came in - I think it was printed on some credit card shaped piece of cardboard and I have no idea where that ended up - so I can't get past the first steps of the installation process.

Is there a way to retrieve a lost activation code from Microsoft?

You need to call them.

Thanks E.J. I got the number and will call, but it's not as urgent anymore. I found the "lost" folder containing windows.

Somehow the migration process had moved that folder from the Applications Folder to the Documents Folder, which broke the link between Parallels and Windows. I found it during document pruning, moved it back to the Applications folder and started Windows by double clicking on the windows.app file, which re-established the link to Parallels. Now I can start it up from the Parallels icon in the Dock again.

I still will have to get the code, though, in case I want to upgrade to the free Windows 10 and will be asked for the Windows 8 code in the process.

I also find it interesting that the migration process shuffles things around.