Windows Vista SP1 includes 17 security updates and 462 hotfixes. Of the hotfixes, 390 out of 462 were previously by request only.
Security Updates, All In One Place
Of the 17 security updates, eight deal with desktop technologies, one with data access components, three with Internet Explorer, and the rest with security, server technologies, Windows Media, data access components, and UNIX migration. All of these updates are already available via the Windows Download Center.
Hotfixes, Hot Off the Grill
72 of the hotfixes included in Windows Vista SP1 have previously been available via the Windows Download Center. What's a lot more interesting are the 390 that were previously available only by request. These hotfixes provide updates to virtually every major Windows subsystem:
.NET Framework (4)
Base Technologies (72)
Computer Management (9)
Data services (3)
Desktop Shell (27)
Desktop Technologies (82)
Internet Explorer (6)
OS Deployment (11)
Printing and Imaging Technology (10)
Server Technologies (8)
Ultimate Extras/Language Packs (1)
Windows Portable Devices (3)
Fortunuately, one of the big improvements in Windows Vista SP1 is support for hotpatching, which enables Windows components to be updated without rebooting.