The issue focused on Microsoft's Internet Explorer browser and Windows Vista Internet Explorer software. Google Chrome was added as an optional browser at no charge to PCs running Windows Vista. Microsoft responded by issuing Windows XP Home Premium Service Pack 3 (SP3), which contained IE 10 for Windows Vista SP2 users. Microsoft stated that Internet Explorer 11 would not be offered as a separate download from Windows Vista SP2 or Windows 7 SP1 because Microsoft believed Internet Explorer 11 could replace Internet Explorer 10 in Windows Vista SP2 and Windows 7 SP