Cortana had betas, The final release finally got on 20 years after the first alpha

Cancelled 1995 Prototype

It was planned for Windows 95, Since it got cancelled, It got changed to Windows 98, But again.

Also you needed to type to make she type, There was not mic

Windows 98 Alpha

Was like W95, But with mic

Windows 2000 Beta

All builds are like W200X Now

Windows 2001 and ME Beta

Well, See on W200X

Windows 7 Beta

The pixels of the window (not grammar) was like the IE9

Windows 8 and 10

The final release, But one month later, W7 and WXP users got the final release