Regrettably, due to spawning of spam pages - only registered users may make edits.
Mail, RSS, AddressBook, Calendar (with extension)
Setting up Thunderbird
Configure mail accounts
private mail account
proceed with wizard. Works pretty well (it found my server without my inputting too much information). You will need your username (ussually your email address) and password.
webmail (e.g. Gmail, MS Live mail, yahoo, etc.)
Can be collected for posterity and convenience.
Importing from Outlook. Not simple, unfortunately. It will connect to a LDAP Server. This makes me want to set one up.