Hi,
The upgrade exams from MCSA 2003 to MCITP have been retired, you can now go for MCSA: Server 2008 by passing exams 70-640, 70-642, 70-646 (these used to provide MCITP: Server admin. but now you get MCSA 2008)
From MCSA: Server 2008 you can upgrade to MCSA: Server 2012 by passing exam 70-417.
Or go straight for MCSA: Server 2012 by passing 3 exams (70-410,70-411,70-412), this is in most cases the shortest path to MCSA: Server 2012 with only 3 exams.
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MCSE:Server Infrastructure, MCSE:Desktop Infrastructure, MCSA Server 2012, Citrix CCIA & CCEE, Cisco CCNA, VMware VCP 3/4/5 Twitter: @dnyvandam http://www.dannyvandam.net