I'd say a lot of people don't know how lucky they are. I was getting away with using Outlook at work until recently when they made up some bullshit about security policy meaning that people working on certain accounts have to use the internal servers, so I've been forced to use Lotus Notes. I say the policy is bullshit, it's not about security, the Notes servers and our laptops are all managed by people in Mumbai anyway, and as such can't be used for government restricted information anyway.
Lotus Notes is possibly the worst piece of shit email client I've ever had the misfortune to use. That's all it's used for, mail and calendar, I know it's more than all that, but who gives a crap when all you want is mail and a calendar?