Microsoft has flipped the switch to start automatically upgrading
copies of Windows Vista to Service Pack 1 via Windows Update. Not everyone will be offered the update immediately, however, as the company is distributing it in phases to “ensure a seamless download experience” – or in other words avoid a situation where thousands of users find themselves stuck in an endless reboot cycle.
Vista SP1 was made available for download to customers last month
, though, so users can still obtain SP1 by downloading a much larger standalone installer from Microsoft’s site if the service pack is not visible in their Windows Update.