Accessing Outlook from RedHat

Is there an application within KDE or GNOME that will allow me to read my outlook mail.

I have a co-worker is trying out Linux (Redhat 7.3) and he would like to be able to access his Outlook mailbox in
Linux. This is an all MS shop with Exchange Server (not POP accounts). I thought that this was discussed in a
previous thread, but when I went to search the archives it was REALLY slow. So, I thought I'd ask to hopefully get a
faster answer.

Thanks,
Peter