Each of SQL Server release like SQL Server 2000, SQL Server 2005 and SQL Server 2008 is further categorized in editions based on their features and capabilities. For example, edition of a specific release may be any of following
Apart from these there may be some other editions like run time edition or web edition. Some editions like Data center edition or enterprise edition can only be installed on Server OS while others may be installed on both server or client OS.
For windows platform the term Server OS refers to different editions of
While for windows platform, client OS would be any edition of following
So while installing any SQL Server version, do consult the requirements related to OS.