The missing piece of the puzzle was messaging. We are now using Microsoft Communicator and I needed to find an App for that purpose. A quick visit to the iTunes App store found one in a few minutes. It's called iDialog. Originally designed for the iPhone and iTouch, it works fine on the iPad although the appearence on the larger screen is reduced to "iPhone size". This is really not an issue since even with a desktop computer most people don't run mesaging full screen (myself included).
Installation was a snap and there are only three fields of information to enter in the iDialog set-up page.
So now I have a full suite of work related connectivity tools; corporate email, calendar, contacts, VPN and corporate messaging. My laptop can't do any better.
I'm closing in on my primary goal.