Microsoft's latest foray into consumer security, Microsoft Security Essentials (MSE), does not live up to Microsoft's advertising fluff.
If you read the LARGE PRINT on the MSE download page, you will see, quite plainly stated, that the product offers "automatic updates".
As it turns out, this is not the case.
If you install this software you will notice your virus & spyware definitions (under the "Update" tab of the application) are often days out of date.
If you look at the Update tab closer, you will find this sentence:
"You should always keep these definitions up to date to help protect your computer against the latest threats."
I have to do this? What happened to the "Automatic Updates"?
Not surprisingly, I'm not the only Microsoft customer who's pissed off about this state of affairs. See this thread at Microsoft Answers for a good laugh.
You can't trust Microsoft to do anything right and you definitely can't trust their advertising bullshit.