> Surely you're joking? Outlook is a crappy email client.

Surely you're joking. First, Outlook isn't for anyone who'd be comfortable operating mutt. Period. Second, sure, Outlook has stupid design-decisions. But nobody claimed that Outlook is perfect, it was argued that Outlook was better than Lotus Notes which is was competing against when it was launched. And it was (and is), leaps and bounds. Third, Outlook isn't just a mail client, it's an integrated communications suite. It has taken OSS years and years to catch up with this. You may not agree that it's a critical feature, but for millions of business users, it's a deal-breaker.

There's good innovation in the kernel-space, too, but user-facing apps are playing catch-up.