Re: Freeoffice et al
I've never used Outlook on my own machines.
In my experience, Thunderbird is more useful than Outlook, even though we have a bunch of people to support email at work. There are features with Thunderbird that are not available from our enterprise outlook solution, at least in our not small (thousands of users) organization... like standard end to end encryption that can be used with people outside our system.
Add a cleaner interface, a raft of optional configurations, high speed, trivial setup for multiple offline mail backups, easy setup for multiple email accounts and servers... I wouldn't use Outlook if it were free.