Of course, you can use Windows 1.0 and all subsequent versions of the OS without a mouse if you really have to. I once had to use our Windows 95 computer without a mouse for a year, because ours ...

And hey, if this trip back in time has you nostalgic, you can try out Windows 1.0 at pcjs.org, which runs emulations of both 1.01 and the 1.0 Premiere Edition on its website.