Advance is an open source personal information management (PIM) system which is database-backed, Qt based, cross-platform, and includes support for KDE. It is designed to look and function like MS Outlook.
Information regarding Project Releases and Project Resources. Note that the information here is a quote from Freecode.com page, and the downloads themselves may not be hosted on OSDN.
This release reworks the task dialog to make it look more like MS Outlook, ports the KDE date selection widget, ports the KDE locale object so that the date and time format may be configured, and changes the date fields to use a timestamp data type.