How can I access exchange server from linux?

[The Captain]

Need to be able to access global address book and my email, can finally move to a full linux machine and drop my window's partition if i can find it :)

[Tracy L]

In addition to the ones Colinc mentions you might like to check out http://bynari.net they have a client that is pretty cool, gives you ALL of outlooks features including the calendar.
http://www.bynari.net/products/insight_webclient/insight_webclient_web_mail_client.html

Good Luck.