Which version of Windows and/or Exchange Server are you administrating? Why not consider that path or even newer?
For your reference before you dive down further, you may want to look at those link for more information.
MCSA Windows Server 2008 - http://www.microsoft.com/learning/en/us/mcsa-windows-server-2008-certification.aspx
MCSA Windows Server 2012 - http://www.microsoft.com/learning/en/us/mcsa-windows-server-certification.aspx
MCITP Enterprise Messaging Administrator 2010 - http://www.microsoft.com/learning/en/us/mcitp-certification.aspx
MCSE Messaging - http://www.microsoft.com/learning/en/us/mcse-messaging-certification.aspx
After reviewing, do share with us if you have any further questions so we can assist further.
Cheers.
Regards,
Milton Goh
MCSE, MCSA, MCITP, MCTS, MCP
Blog: blog.nerdytwo.com
Twitter: @miltongoh