GroupWare   
http://www.altn.com

MDaemon GroupWare unlocks the collaborative functions of Microsoft Outlook using MDaemon as the mail server platform. Outlook users can share Calendar, Tasks, Contacts, Notes, and Journal folders without the expense or expertise required by Microsoft Exchange Server. Features include user configurable permissions where GroupWare users has control over the permissions of which folder(s) they wish to share with other users, WorldClient (MDaemon's web-based email client) will allow you to see items in your Outlook calendar from anywhere, and GroupWare licensing is independent of your MDaemon license size.

ZFilter   
http://www.4-share.com

ZFilter is a plug-in indexing filter for Windows servers. It enables them to full-text index the contents of zip archives created with WinZip, PKZIP, or any other compression program that uses the PKWARE compression format. ZFilter is designed for Internet Information Server, SharePoint, Exchange Server, Site Server and SQL Server: it is compatible with Windows NT 4, Windows 2000, XP and Server 2003.

Alchemy Spam Filter for Outlook Express   
http://www.alchemy-lab.com

Get rid of spam with Alchemy Spam Filter for Outlook Express! Alchemy Spam Filter is a plug-in module for the Outlook Express e-mail program and represents a self-adaptive unsolicited mail protecting tool. The main method used to combat spam is the statistical algorithm of Bayes. The Bayesian filter is the most efficient anti-spam solution nowadays. Based on self-learning technology, it is more effective than other traditional anti-spam techniques, based on static blacklists checking and keywords databases. Properly learned, this filter can reach spam detection rate up to 98% with minimum false positives. Alchemy Spam Filter also supports the user defined white, black and ignore lists that can be a useful addition to the Bayesian engine correcting its behavior.

Outlook Connector for MDaemon   
http://www.altn.com

Outlook Connector for MDaemon unlocks the collaborative functions of Microsoft Outlook using MDaemon as the mail server platform. Outlook users can share Calendar, Tasks, Contacts, Notes, and Journal folders without the expense or expertise required by Microsoft Exchange Server. Features include user configurable permissions where Outlook Connector users have control over the permissions of which folder they wish to share with other users; users will have only one Inbox; and sent messages will be saved in their IMAP Sent Items folder; Mail folders can now be shared without needing to use an Outlook IMAP account; Outlook Connector uses the same shared information available through MDaemon built-in web mail, WorldClient, shared information can be viewed from anywhere via WorldClient or Outlook; additions or changes made in Outlook are synchronized in real-time on the server, no user synchronization is required; and Outlook Connector licensing is independent of your MDaemon license size.

MultiSchedule   
http://www.atx.be

Networking calendars MultiSchedule is a calendar software application that can be used on a network or on just one computer. Multiple users can use multiple computers to input/view/edit calendar events simultaneously in real time. All data are stored on a central server/computer. No dedicated server/computer is needed. The client side software can coexist with the server side software on one computer. It works for both Peer-to-Peer network and Client/Server network. Connect to the calendar server through Internet If you have a server that is accessible over the Internet, MultiSchedule will be able to connect to the server over the Internet! We recommend that you use a DSL/ADSL or Cable modem to connect to the server if you are connecting to it over Internet to get the best result. If you don't have a server you can use the "Hosted" version of MultiSchedule and we will take care of your database on our servers which have a super fast connection. This way you don't have to bother about your calendar data, you will be able to access it on every computer that has Internet access. Synchronize with MS Outlook MultiSchedule is able to do two-way synchronization with MS Outlook. This way you can synchronize your calendar with your MS Outlook, without having to buy an extremely expensive MS Exchange Server. From MS Outlook you can Sync again to your PDA with your standard PDA-sync-software. Custom appointment / task properties Customizable appointment / task properties. Set up your own appointment and task properties. You can organize your appointments with these custom properties. For example: You add a custom field Invoiced or Paid to your calendar-items. This way you can check if an appointment has been paid for or has been invoiced already.