Windows XP is very old and is quickly getting replaced. But is it still worth it to get the Windows XP 70-270 MCP?
If you have a choice between getting Windows 7 and Windows XP...go with the 7 certification line. But if you just want to write a cert, then you can't go wrong with XP. But I would not prioritize any money you have toward certification in to it UNLESS you see a job posting out there that is asking specifically for Windows XP. And don't take the 70-270 certification lightly...it's one of the trickier certifications out there. Not as bad the 2003 security design certification, but still go in well prepared.