Because updates to Windows Update don't rely on users having set the mechanism to automatically receive and install all fixes, everyone who runs the service will receive the update. Windows Update updates are installed whenever the service is engaged, whether automatically, manually or the in-between mode that only notifies users of impending updates.

Only PC owners who have disabled the service and never use it -- experts have long suspected that users running counterfeit copies of Windows avoid it because they fear being found out -- will not be migrated to the new, more restrictive certificate model.

Microsoft did not set a day this week when it will issue the update for Windows Update.

Gregg Keizer covers Microsoft, security issues, Apple, Web browsers and general technology breaking news for Computerworld. Follow Gregg on Twitter at , on or subscribe to . His email address is .

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