Exchange

ADModify.NET is a tool primarily utilized by Exchange and Active Directory administrators to facilitate bulk user attribute modifications. See http://blogs.technet.com/exchange/archive/2004/08/04/208045.aspx for launch details
DavMail is a POP/SMTP/Caldav/LDAP exchange gateway allowing users to use any mail/calendar client (e.g. Thunderbird with Lightning) with an Exchange server, even from the internet or behind a firewall through Outlook Web Access. DavMail now includes an LDAP gateway to Exchange global address book to allow recipient address completion in mail compoze window and full calendar support with attendees free/busy display. DavMail gateway is implemented in java and should run on any platform. Releases are tested on Windows and Linux (Ubuntu). MacOS support is currently limited to server (headless) mode. Tested successfully with the Iphone (gateway running on a server).