direct access to IMAP4 capable servers like Cyrus, Courier or Exchange
access to external POP3 servers using fetchmail
support for all popular functionalities (reading, writing, forwarding,
reply, reply-all, attachments, etc)
make use of the central contacts database
send attachments either as complete files or as small links
server based filtering, searching and sorting
vacation messages
personal distribution lists
direct import of whole emails or parts to either company contacts or
projects
IE only: drag and drop support for sorting mail into folders