There have been a lot of questions in the blogosphere lately about Microsoft ChoiceGuard. What it is, and why it’s being installed when you install Windows Live Betas… So, here are a few answers.

Microsoft ChoiceGuard is a lightweight software component that enables the choices you makelike what you want to set as your default home page and search providerduring the Windows Live Beta installation process.

If you choose to do so (and ONLY if you choose to do so), Microsoft ChoiceGuard will set your home page and search provider in both Firefox and Internet Explorer. Typically this is a simple task. However, several of our competitors install a "service" that is always running on your computer that prevents your Internet Explorer search defaults from being changed, even if you requested the change yourself. So Microsoft ChoiceGuard looks for the presence of those applications that might be preventing your choice from being carried out, and works around their block to set the default.

It turns out that if you use Firefox, you have to install an add-on to do this. Since there is no point in having the ChoiceGuard add-on on your computer after setting your defaults, ChoiceGuard immediately sets itself to uninstall. That’s why you will see “Microsoft ChoiceGuard” in the Firefox add-on list, and that’s why it also says it will be uninstalled the next time Firefox restarts.

The good news is that Microsoft ChoiceGuard only sets the defaults once. If you choose to change these settings later, either programmatically or manually, Microsoft ChoiceGuard won’t get in the way.

I hope this clears things up a bit. Keep sending us your feedback—We’re listening!

– Hua Ai and Mikko Ollila, Live Search team