If you are still using Windows Server 2003 in your environment, Microsoft support for Windows Server 2003 ends July 14, 2015. As a reminder, when Microsoft no longer supports a product, neither do other software developers.
You may also want to look at the OnBase Product Support Lifecycle list as you plan your server upgrade.
Jennifer (aka Pixie) has over 20 years of experience in the Information Technology field, which includes 13+ years of Systems Administration and 15+ years of developing and implementing technical documentation and training. She has extensive experience with OnBase, SQL, and a firm foundation in computer science. Despite this, she considers herself a well-adjusted nerd with hobbies including gardening (poorly), archery, and knitting in public.