Microsoft history is full of silly mistakes like that. My favorite one, and one I got in on, was back in the days of Windows 98. You could fill out a request form on their web site & you'd get four CDs in the mail for trial of their products: One was a time-limited copy of Windows 98, the second disc was Microsoft Office, the third was Microsoft Publisher, and the fourth was something I forgot.
It was a great promotion for Microsoft till someone realized that the Windows 98 disc was the only one time-limited. Everything else was full retail products...corporate versions that didn't require serial key input, too.