The OWA package on http://www.cobb.uk.net/OWA can be used, in conjunction with 
the [webdav] package, to access documents on a Microsoft Exchange server using 
Outlook Web Access.

Included at that site is an example of using the OWA package to keep KNotes
(a Linux PIM module that provides sticky notes) in sync with your Outlook Notes
folder.
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There is also (at the same location) an application using this package to provide 
IMAP clients with access to mail on an OWA server.
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I have added an owaSync package which automatically keeps local copies of
Notes, Calendar and Contacts folders in sync with the Exchange versions.
It is only one-way sync at the moment (copying from Exchange to the local folders)
but that is still useful.  In particular this cn be used to keep the KDE kontact
application up to date with contacts, appointments and notes from Exchange.

I also use it with my Nokia 770 Internet tablet.