Upgrade windows 2003 server standard to SERVER 2008 standard?

I would like to upgrade two windows server 2003 standard edition to windows server 2008 standard edition on 32 bit.  What do I buy in order to do this?  An OEM product? Or a regular copy of windows sever 2008?  The original software was OEM.  If I purchase Windows server 2008 standard edition (OEM), will I be able to upgrade my existing OS with this type of software?
manch03Asked:
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Lee W, MVPTechnology and Business Process AdvisorCommented:
You cannot upgrade using OEM software.  OEM licenses are for CLEAN installs only (By Original Equipment Manufacturers).  You need EITHER an upgrade disk, a retail disk, or a volume license disk.  Finding a copy of 2008 from a trustworthy source these days might be difficult.  If you purchase Server 2012 R2, you should get downgrade rights to 2008 R2... and POSSIBLY earlier... and the media for it would be on the Volume License Service Center (VLSC).  (I just checked and it APPEARS I still have access to 2008 (non-R2 in my VLSC Portal).
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