Once your users start using OWA under Exchange 2000 or Exchange 2003, they'll quickly get hooked on its impressive feature set, especially under Exchange 2003. However, as your users roam to various computers, such as those in their home, they may run into a problem. With Office 2000 installed on some computers, your users may experience a constant error message indicating that they need to install Office components in order to send or reply to a message. Your user will get this error message quite a few times before they are able to send their message. It's frustrating, to say the least.
There are two ways you can correct this error. First, you can just follow the instructions and insert the Office CD that is being requested. If you follow the instructions on the screen, your problem should be resolved.
However, not everyone has their installation CDs readily available. Therefore, you can use Add/Remove programs to achieve a similar goal. From this Control Panel, select Microsoft Office 2000 and add select the Change button. Remove the feature HTML Source Editing. By default, this feature is set to install on first use, which is the reason your users get the continual pop ups. By removing this feature, you take away the problem and don't need an Office CD to do it.