Smallest web and E-Mail server, possible Linux or Windows?

[takemehomegrandma]

Also, is there a such a thing as a web and E-Mail server on a chip?
If not I was thinking about building some hardware that could run on solar power and then use either Linux or Windows. I am not sure what operating version I would be using.

Really small, but maybe a bit limited:
http://en.wikipedia.org/wiki/SheevaPlug
http://plugcomputer.org/

Really small and cheap, and a bit more complete:
https://www.genesi-usa.com/store/details/11
http://bbrv.blogspot.com/2011/05/solar-powered-energy-generation-system.html