MCSD.Nets can upgrade to all three MCPD (i.e. Web Dev, Windows Dev and Enterprise Apps Dev) using only 3 Upgrade Exams instead of 4... So here is the quick FAQ...
Q: Can exam 554 be taken without 553 having already being taken and passed?
A: YES, 554 CAN BE TAKEN WITHOUT 553 (BUT ONLY MCSDs WILL GET CREDIT FOR 553 OR 554).
Q: If so would that mean that an MCSD.NET can obtain all MCTS and MCPD certs by passing just three exams 551, 552 & 554?
A: YES, AFTER AN MCSD EARNS THE MCPD: WEB AND MCPD: WINDOWS WITH EXAMS 551 AND 552 (AND IN DOING SO, BOTH MCTS WEB AND WINDOWS), HE OR SHE CAN TAKE 554 TO EARN MCPD: ENTERPRISE APPLICATIONS (AND MCTS: DISTRIBUTED).
You can also see the rationale behind this on one of my previous posts... Click Here
We will upgrade the microsoft.com pages soon for more updates on this thread check Trika's blog too...