Go here to find out what M$ says.
http://www.microsoft.com/learning/mcp/mcp/requirements.asp
The CompTIA A+ and Network+ combination can be used to substitute for an
elective requirement when taking a series of M$ exams to fulfill the requirements for certification in using a complete product line, like MCSA Windows 2000. The MCP is received by passing one
Microsoft Product exam, not for passing CompTIA exams. When you pass a CompTIA exam you are a
CompTIA Certified Professional.