回复：群策群力，build一个家用24小时常开的server，运行linux，提供email，voip。。。。

If you have an old computer that you don't want to use any more. You can use it. The oldest I have used was a P MMX 200mhz cpu, 128mb ram and 8gb of hard drive. It had run over a year without any problem till my friend bought a dell server.