Hello soybean,
Rightly or wrongly, this is what l was told but it sort of makes sense.....
Microsoft Security Essentials auto-updates once every 24 hours and there is no setting within MSE to change the scheduled time or frequency. As such, you can always manually download the latest Microsoft Security Essentials updates via the update tab.
Announcement - Quote from MS
Microsoft has confirmed an issue with Microsoft Security Essentials that can occur when some PCs are regularly offline for extended periods and are frequently toggled between sleep/hibernate and active mode. In some cases, these machines may be delayed in receiving their regularly scheduled signature updates.
Microsoft is aware of the problem and is working on a solution. In the interim, we recommend that users who are not regularly online and who frequently sleep/hibernate their machines reboot or manually update their signatures at least weekly to ensure they have the latest threat definitions downloaded.
Mmmm? Still think l'll stick with MSE for now, but knowing that l can always revert back to Avast. It seems Avast now have a new Version out (V5) which some people are having problems with and others are not. Will see how things progress.
Regards
WTC