Hi,
Do you have MCSE 2003 or MSCA 2003 certification?
If so then you can upgrade to MCSA Server 2008 and then do the 70-417 upgrade exam to MCSA 2012.
Have a look at the wiki that I wrote on the upgrade paths:
http://social.technet.microsoft.com/wiki/contents/articles/16483.upgrade-from-mcsamcse-2003-to-mcsa-server-2012.aspx
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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