The Enterprise...
...is still using IE6 FFS.
Microsoft – unlike its browser rivals – will not be patching Internet Explorer before the upcoming Pwn2Own hacking contest next week. A March Patch Tuesday pre-alert, published on Thursday, reveals that Redmond will be issuing three security bulletins next week, one of which affects a critical flaw in Windows and none of which …
and is it for this reason why some many people are moving away from IE to alternative browsers. Ms has a ton of software but they cannot keep up with the vast bugs found in their software. This is why they are losing market share in many of their core products. Windows might be one of the few exceptions but likely not once you factor in consumer rather than strictly corporate.
Microsoft has at least 2 reasons not to patch IE before the PWN2OWN contest:
1) So, after they are instantly PWNed, they can say "we could have released last-minute patches, too!", and spin things around so it looks like they are on even footing with the other browsers. Which they are not.
2) Because quite frankly, they do not KNOW what to patch until the PWN2OWN hackers TELL them which of many security holes they have attacked. This is the very same approach they take with all their software products: just release them into the wild, and "see what happens" to those foolish enough to use them. Then patch a couple of the most obvious loose ends, and repeat until they go out of business.