How safe is microsoft firewall?

When Windows XP was originally shipped in October 2001, it included a limited firewall called "Internet Connection Firewall". It was disabled by default due to concerns with backward compatibility, and the configuration screens were buried away in network configuration screens that many users never looked at. As a result, it was rarely used. In mid-2003, the Blaster worm attacked a large number of Windows machines, taking advantage of flaws in the RPC Windows service[1]. Several months later, the Sasser worm would do something similar. The ongoing prevalence of these worms through 2004 would result in unpatched machines being infected within a matter of minutes[2]. Because of these incidents, as well as other criticisms that Microsoft was not being proactive in protecting customers from threats, Microsoft decided to significantly improve both the functionality and the interface of Windows XP's built-in firewall, and rebrand it as, simply, "Windows Firewall".

How safe is microsoft firewall?adware

If you don't trust it, then don't use it.

How safe is microsoft firewall?antivirus scan

it has been improved somewhat, but I think it still has holes.......I use zonealarm in conjunction with
I myself do not use it. I recommend ZoneAlarm free edition.
I haven't heard of security holes in it. I believe it does it's job as advertised. It is designed to block incomming requests for services. Many people want outbound control too, in which case you need something like Zonealarm.
It still stinks, go download zonealarm free
Why not ask your boss?
it's ok, wouldn't bank on only that though