Given all the news about hacks with self-hosted Exchange, more likely they're relaying through hosts with a built up trust... As good as Exchange + Outlook are

Given all the news about hacks with self-hosted Exchange, more likely they're relaying through hosts with a built up trust... As good as Exchange + Outlook are as a user, it is pretty painful to see exploits in the wild like this. The whole system just sucks as a whole, and feels too entrenched to come up with something better. Even a notify+pull system wouldn't fix these kinds of exploits, even if they would correct end-user breaches.