The company said the new client and server operating systems would help improve the software's efficiency, performance and security.
Windows Vista Service Pack 1 (SP1) will be available to customers from March, starting with Microsoft Volume Licensing customers.
Windows Server 2008 will be available for purchase to new customers from 1 March.
Microsoft Volume Licensing customers with active Microsoft Software Assurance coverage or an enterprise agreement will be able to download the server software towards the end of February.
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The new Microsoft SQL Server 2008 and Visual Studio 2008 will be available at the same time.