#1 Free OneDrive Client for Linux
Document Management System and Content Management System
Sync Outlook with Google, SOGo or any other CalDAV / CardDAV server
Sync Outlook contacts and calendars with Google
Automatically generate Outlook signatures based on templates and LDAP.
for Adium, Pidgin, Miranda and Telepathy IM Framework
Open Source Enterprise Content Management ECM
Outlook Plugin for storing emails to Alfresco
SyncML .NET API and Outlook Addin
Email client written in C# .NET; fast and smart, 1 button push mailing
Outlook Macro for moving specific mails and reading their content
Find and remove duplicate items in Outlook such as contacts and mails.
Convert Outlook and Outlook Express files to open formats
Microsoft Exchange compatible server and client libraries