We've been using Google Apps at work for years, ever since the service was first offered. Unfortunately, I was never able to force^H^H^H^H^Hconvince the old^H^H^Hsenior management people into using it, as they're all comfortable with using Outlook Express or in some cases, Thunderbird, on their notebooks.
I still can't believe how bad Outlook Express (and even Outlook) is. I got bitten by Outlook's 2 GB limit per mailbox so incredibly many times that I have all the tools and the fixing steps memorized by heart. Unfortunately, all the senior management love Outlook Express because it has a simple way to click and select contacts that you want to send emails to.
My prayer has been answered, in the form of the contact chooser.