Original: Pack 1 Windows Vista Service Pack 1 (SP1) was released on February 4, 2008 alongside Windows Server 2008 to OEM partners, after a five-month beta test period.
Simplified: Service pack 1 Windows Vista Service Pack 1 (SP1) was released on February 4, 2008 alongside Windows Server 2008 to OEM partners, after a five-month beta test period.