Why did Microsoft said me an email telling me I reserved Windows 10?

I got Windows 10 a whooping two hours early. Would of been sooner, if I knew what to do. I didn’t read the email, I don’t need to know what’s next. What’s next is it works. And my SSD might be slower or something, some programs take longer to open. That’s what I can buy, a 1 TB SSD for Windows.

960 GB is plenty, I like SanDisk, I read they have good support, so if the drive dies, it should be easy to get a replacement.