It's bullsh1t. It's not true. It wasn't an "investment". Microsoft stole Apple code and used it in Video for Windows. It got caught. Apple took MS to court and was going to win, so it settled. The marketing-lizards span this as "investing" but it's not true.
Not only I walk this planet since the 1970's, I lived through this "lie" on all key publications of the time, and I used the Cult of Mac site on purpose, exactly because I was expecting that reply of yours.