Operating System Requirements of SharePoint 2010

Check out the latest Operating System Requirements for SharePoint 2010:
http://technet.microsoft.com/en-us/library/cc262485(office.14).aspx

Announcement:
http://blogs.msdn.com/sharepoint/archive/2010/01/22/operating-system-requirements-of-sharepoint-2010.aspx

Notes:

To make developing for SharePoint 2010 easier, it is possible to install SharePoint on 64-bit versions of Windows Vista SP2 and Windows 7. Note that running production environments on these OSes are not supported and it will not be possible to upgrade deployments running on client versions of Windows to future versions of SharePoint. Instructions on installing SharePoint 2010 on client versions of Windows are a bit more involved and we recommend reading the instructions at http://msdn.microsoft.com/en-us/library/ee554869(office.14).aspx.