Windows Server 2003 is coming to an End-of-Life on July 14, 2015.
Personally, I love Windows Server 2003, one of the best servers created by Microsoft. I had amazing experiences deploying applications on IIS6 and also doing troubleshooting on this platform.
You should already be on Windows Server 2008 or 2012 and running IIS7.5 or IIS8 ; otherwise, start preparing your migration plan, Right away!.
There is a good bunch of information been posted on different Microsoft Sites, and I will try to compile here those that I find most useful.
Don’t panic! We’ve got 10 resources to help you upgrade from Windows Server 2003http://blogs.technet.com/b/mva/archive/2014/08/26/don-t-panic-we-ve-got-10-resources-to-help-you-upgrade-from-windows-server-2003.aspx
Windows Server 2003 end-of-support websitehttp://www.microsoft.com/en-us/server-cloud/products/windows-server-2003/
Best Practices for Windows Server 2003 End-of-Support Migrationhttp://blogs.technet.com/b/server-cloud/archive/2014/08/26/best-practices-for-windows-server-2003-end-of-support-migration.aspx
Keep an eye on this post...