Hi,
The MCITP is going going and will be gone by around July 2013. There are no direct upgrades for the Enterprise Admin 2008as MCITP is no longer available (they changed the names, requirements, etc).
Since you have the MCITP 2008 then you should have the MCSA 2008 which can be upgrade to MCSA 2012 by passing the 70-417 exam -
http://www.microsoft.com/learning/en/us/certification/cert-windows-server-MCSA.aspx. Then you can go onto the MCSE 2012 via
http://www.microsoft.com/learning/en/us/certification/mcse-server-infrastructure.aspx.
Sean Massey | Consultant,
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