SharePoint Server Downloads

Microsoft
http://www.microsoft.com/downloads/en/resultsForProduct.aspx?displaylang=en&productID=353C4E9D-9E78-4435-A360-01BB7F540D17

TechNet
http://technet.microsoft.com/hi-in/office/sharepointserver/bb643276(en-us).aspx

Downloads for Windows SharePoint Services Developers - MSDN
http://msdn.microsoft.com/hi-in/sharepoint/aa905690(en-us).aspx