Outlook add-ins - are special extensions for Outlook, which allow you to add extra features to the main program. Interest in the add-ins can be easily explained by the fact that Outlook does not have some features that are implemented in other mail programs.
Here are examples of popular Outlook add-ins types:
Outlook object model
Outlook has a special object model, based on the Component Object Model (COM) technology, which can be used by programmers to create their own solutions using Visual C # or Visual Basic languages.
Such a module can be created by virtually any author, so they may have widely different capabilities limited by author’s fantasy only. Using add-ins allows user to customize a program “personally for himself”, so “more add-ons, better” principle might nicely work here.
Special Outlook backup add-ins
Currently there are several popular backup add-ins for Outlook, such as Personal Folders Backup Add-In and Backup Exec Outlook Add-In. Instead of manual copying or use Import/Export options, it is easier to use Outlook backup addin.
Creating Outlook Addin
Note that add-ins can be specialized for one or several Outlook version. For example, the special Personal Folders Backup Add-In does the backup Outlook 2007, 2003 and 2002.
Outlook 2010 Backup - protect your e-mails, calendars, tasks and other Outlook data without stopping the program to copy data