From what i read on the MSE forums, the updates are working at different times for people. Some are being updated daily some every 2 or three days and some weekly. Here is a comment from a microsoft moderator
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Tuesday, October 06, 2009 11:35 AMStephen BootsMVP, ModeratorUsers MedalsUsers MedalsUsers MedalsUsers MedalsUsers Medals
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No, you are updated automatically on a schedule once per day (you can't change the check time) plus a catch-up update check if the scheduled one was missed, plus a check at scan if you have that option selected.
The feature change would be that the updates used to clash with AU/WU in that you would sometimes find multiple updates offered via WU when MSE had not yet caught up. MSE now apparently handles the updates exclusively and they should not be offered in WU/AU any longer. (At least that's how I understand the change).There are other discussions regarding the minimal changes in signatures and why you should not worry about the frequency of updates. Your PC is not considered *at risk* by MSE itself unless it has not updated in a week. Don't forget that the MSE heuristics detection capability is in play, too. Signature based scanning/protection is only one part of the equation *and* by the time signatures have been updated, the threats are already fairly old.
-steveMicrosoft MVP Windows Live / Windows Live OneCare, Live Mesh, & MS Security Essentials Forums Moderator
Here is the link, there is more recent conversation further down the thread. Hope it helps you some.
http://social.answers.microsoft.com/...-63ccdd4a199c/