Original source: here

Windows 2000 Server

Extended Support for Windows 2000 Server will end on July 13, 2010. At this time, Windows 2000 Server will no longer be publicly supported.  You will be able to continue using "Self-Help Online Support"*

Windows Server 2003 and Windows Server 2003 R2

Also on July 13, 2010, Windows Server 2003 and Windows Server 2003 R2 (at a supported service pack level) will move from the Mainstream Support phase to the Extended Support phase.  During the Extended Support phase:

• Microsoft will continue to provide security updates and paid support (Example: Premier and Essential support, per-incident telephone/web support, etc.)
• Customers will continue to have access to all security updates and Self-Help Online Support options (Example: Knowledge Base articles, online product information etc.)
• Non-security hotfixes developed during the Extended Support phase will be provided ONLY to customers who enroll in Extended Hotfix Support (EHS).

Please note: If you’d like to enroll in EHS, customers must already have a Premier Support contract. In addition, customers must enroll in EHS within the first 90 days of the Extended Support phase.  Program and per fix fees may also apply.  Customers with Software Assurance can enroll in EHS at any time.  

Service Pack 3 for Windows Server 2003

We have received inquiries from our customers and partners on whether or not there will be a need for a Service Pack 3 for Windows Server 2003.  Microsoft will not have a SP3 release for Windows Server 2003. 

To Summarize…

• Self-Help Online Support* will be available for Windows 2000 Server after Extended Support before it ends on July 13, 2010.
• Windows Server 2003 and Windows Server 2003 R2 will begin an extended support phase on July 13, 2010
• There will be no Service Pack 3 for Windows Server 2003

*Self-Help Online Support is available throughout a product’s lifecycle and for a minimum of 12 months after the product reaches the end of its support. Microsoft online Knowledge Base articles, FAQs, troubleshooting tools, and other resources, are provided to help customers resolve common issues.

Where can I get more information?

• Public information on Microsoft Support Lifecycle policies: http://support.microsoft.com/lifecycle/
• FAQ: http://support.microsoft.com/gp/lifepolicy
• Product Support Dates Search: http://support.microsoft.com/search/
• Microsoft Support Lifecycle Newsletter Sign-up: Go to http://support.microsoft.com/lifecycle, then click on the "Subscribe to Microsoft Support Lifecycle Quarterly Update Newsletter"

want to know which version of windows server 2008 you are running? Open a command prompt and type:

wmic OS get OperatingSystemSKU

it will return a number, convert it to hex and look it up in this table:
http://msdn.microsoft.com/en-us/library/ms724358.aspx