The MCITP certification is still valid when you already have it and you want to upgrade to the new MCSA: Server 2012 certification. I would not recommend taking a MCITP training based on Server 2008. Investing in a Windows Server 2012 training and certification
has more value for the next few years and this certification will be valid longer.
Start with MCSA: Server 2012 (exams 70-410, 70-411, 70-412)
From there you can move on to MCSE: Server infrastructure by passing two additional exams ontop of MCSA.
Then you will have the most recent certification that equals MCITP: Enterprise Administator.
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Danny van Dam