After all this time, all these spams, all the complaints from all over the globe, I can only come to one conclusion: Microsoft is trying to kill email.
Let's take a look at some facts. Spam levels are as high or higher than they've ever been. From my own personal experience, I can say without a shadow of a doubt that 99.9 percent of all email coming to my mail server is spam. That's tragic all by itself, but it's been that way for quite some time now. I have written and documented the severe steps that I've taken to reduce the problem, but the fact remains that hundreds of thousands of connections are made to my mailserver every day, trying to sell me v1@gr@!, inform me of my incredible good fortune in some foreign lottery, or tell me that really need to buy stock in some company nobody's ever heard of.
Hundreds of thousands of connections, coming from thousands of hosts. What are those hosts anyway? The vast majority of those hosts are exploited Windows systems. They're zombies run by botnet operators. Their owners are probably completely clueless to the maelstrom that has engulfed their little Dell desktop. It's just "slow".
There are millions of these systems out there, according to an article from USA Today. Millions.
The mainstream media consistently use the term "computers" when they make forays into this realm. Yes, they are computers, but they're not just any computer -- they are all running Windows. All of them. Let's not mince words here: Botnets are comprised of compromised Windows systems. Thus, Microsoft's massive security failures are at the very core of the spam problem.
Yes, there are still spammers out there that use specific servers and subnets to send their trash, but they're relatively easy to identify and stop, either by the ISP, or through filtering at the client side. Connections from millions of unique systems from all over the globe are much harder to stop. Some of the ways that spam filters try to stem this tide is by identifying subnets assigned to residential cable and DSL providers, and blocking those IP ranges. That's like bringing a sledgehammer into surgery, but it can be effective -- so effective that it blocks legitimate communications from people running their own servers, and hundreds of companies using cable and DSL connections for their business. The subnet allocations caught up in these traps aren't necessarily accurate, and they can cause email to simply disappear at worst, or consistently be marked as spam at best.
Speaking of email simply disappearing, this brings me to my next point about Microsoft's apparent attempt to kill email: Hotmail.