Kevin asked: "How long do I have to get my MCSE before it gets replaced with the new certification?"
Hello, Kevin. Thanks for your question. How are you?
The MCSA and MCSE won't be retired - but at some point, the associated EXAMS do retire, so it is no longer possible to earn the certifications. In the case of Windows Server 2000 exams, those are set to retire in March 2008.
We don't have a planned retire date for the Windows Server 2003 exams... but you can imagine it won't be any time soon (2000 exams retiring in 2008...) and there will be a year's notice before the exams retire.
The MCSA and MCSE (for Server NT, 2000, 2003) will continue to live side by side with MCTS and MCITP (for Server 2008). The new 2008 certs will be available sometime in early 2008 (after the technology releases to manufacturing)... but for a LONG TIME TO COME after that, you can continue to start and complete your MCSA or MCSE on Windows Server 2003.
If you work wtih 2003, you'll earn your MCSE; if you work with 2008, you'll earn your MCITP; if you work with both, you can earn both.