While my mum cleared the house out, she found an envelope from microsoft adressed to my mum and me including a signed photo from Bill Gates. I was very surprised and can't remember when I got the letter. Unfortunately there was no date on the stamp or the envelope

But it must be about 10 years ago. That was when I started collecting with my mum. I guess I must have written an e-mail to microsoft.
What do you think? I googled and found some other photos with exactly the same signature but sometimes there is a slight difference... don't know what to think.... but to be honest, it's probably an AP or PP.
Comments on authenticity are welcome!
Sparkly ?