ShareCalendar   
http://www.4team.biz

Share Microsoft Outlook Calendar Folders without any server. Share different Calendar folders with different group of people. Create Group Calendar. "Subscribe" your folders' / subfolders data for your clients. Share Microsoft Outlook Calendars with your own custom forms and imported items. Work offline or online. Labels (colors) sharing in appointments sharing. You can synchronize shared Outlook items with your PDA or Palm device. Synchronize Outlook Calendar data between your desktop PC and laptop. Simple access control. Easy-to-use workgroup application. Start sharing in minutes.

Add-ins for Microsoft Office Outlook   
http://soft.ria-media.com.ru

RIA-Media Add-ins for Microsoft Office Outlook: Redirect, Duplicates, Attachments.

ADX Toys 2 OL   
http://www.office-addins.com

ADX Toys 2 OL is a COM add-in that adds several useful features to Microsoft Outlook (see screenshot). The add-in is based on Add-in Express 2 technology (http://www.add-in-express.com/) and designed to show you how to create add-ins, how to manage add-in's toolbars and controls, and how to get an access to Outlook objects. ADX Toys 2 OL supports MS Outlook 2000 and higher.

Quickfile for Outlook   
http://www.addins4outlook.com

QuickFile 4Outlook is a unique addin that allows you to organize your emails as they arrive in the easiest and most flexible way. The software can also be used for all outgoing mails as well, since they can be appropriately filed in the folders that you prescribe. An easy-to-use wizard can scan all your current folders and learn from your current filing options, so that it can correctly file all future incoming and outgoing email messages. This Outlook addin is extremely convenient and flexible as it can remember where you want to file emails from specific senders plus it lets you see your email before it is filed away. QuickFile for Outlook is ideal for the busy executive that sends and receives large numbers of emails and wishes to spend as little time as possible to organize his/her emails without having to go through a learning curve of using a difficult email organization tool. It is also essential for anyone doing project/case based filing since it can automatically file emails depending on person and project. QuickFile for Outlook is the easiest most flexible and complete way to send & file your emails that can save you trouble and time.

noHTML for Outlook Express   
http://www.baxbex.com

Protect Outlook Express from Virus Attacks and Spam noHTML for Outlook Express noHTML for Outlook Express is an add-on that protects Outlook Express from email viruses and email scripts such as Nimda and SirCam. By converting incoming email messages from HTML format to simple text, the program lets you read your emails much more quickly, and eliminates the danger posed by most email-borne attacks. Outlook Express is the most widely used email reader in the world, and is also the biggest target of the virus and trojan writers. noHTML for Outlook Express is the first and only program that can disable HTML directly within Outlook Express. The program disables HTML in both the message area and the Outlook Express preview window, protecting you from the scripts that can attack your computer, even if you don't open them. In addition to protecting you against virus and trojan attacks, noHTML for Outlook Express protects you against spammers who send you emails repeatedly. The program eliminates both the scripts and the linked images that spammers rely upon to confirm that your email address is valid, and that you have received their messages. noHTML for Outlook Express integrates seamlessly with Outlook Express versions 5 and 6. It adds a button onto the Outlook Express toolbar, and with a single click you can enable or disable HTML in your incoming email. The program's interface is available in English and German. noHTML for Outlook Express lets you read your email in less time, eliminates the handshake that spammers use to confirm that you've received their message, and disables HTML-based scripts that can infect your computer.