In this tutorial you can find instructions to manage and disable the unnecessary plugins in Word, Excel, Outlook and PowerPoint programs to improve their performance. Although add ins are generally useful, in some cases they can cause the malfunction of a program and you have to disable them in order to regain the program's functionality. For example an 'Antivirus' add-in, for Outlook Email program, can offer antivirus protection for all received e-mails. An 'Add-in' (also known as: plugin, addin, add-on, addon, or extension) is a software component that adds a specific feature to a specific application.