Solaris hasn't been scaled down to cellphones, but remember that today's cellphone is yesterday's high performance workstation. A Raspberry Pi outperforms a SPARCStation20: http://eschatologist.net/blog/?p=266
Windows also used to scale down quite well; I'd love to know how much really was common between NT and CE.
Windows also used to scale down quite well; I'd love to know how much really was common between NT and CE.