A few months ago I switched from Outlook to Google for email, calendar and contacts. The move was prompted when I knew I was going to get an Android phone, specifically the Motorola Droid. Google designed the Android operating system for phones so it seamlessly connects with all of Google’s applications.
I would highly recommend using Google for email, calendar and contacts. I can access any of that from any internet-enabled device. It’s really great for productivity and it’s great to know I don’t have to worry about backups.
For email, Google acts like an email client (Mac Mail, Outlook, etc) and manages email for all of my accounts. I use the labels (like folders), to organize it all and keep different email accounts separated. Switching was a bit of a pain because I had to move 45,000 emails. Yes, 45,000! I used the process described here, that leverages IMAP. It took 3 days and I transferred a bunch over night.
I use the following Google applications regularly, if not daily:
Between Google and Remember The Milk, that’s how I stay organized (at least the church stuff).
Google organizes my life too. I couldn’t go a day without using gmail, calendar, docs and reader!