When I click on Send and Receive in Microsoft Outlook I started getting the error Interface Not Registered. This error started to appear after I installed some video editing software and also ran some updates to the software. I searched around the Internet and found this solution from Microsoft which fixed my problem.

You receive the “Interface not registered” error message when you try to send or to save an e-mail message to the Drafts folder in Outlook 2002

SYMPTOMS
If you use Microsoft Word as your e-mail editor in Microsoft Office Outlook 2002, and you try to send e-mail messages or to save e-mail messages to the Drafts folder, you may receive the following error message:

Interface not registered

Or, you may experience the following symptoms:

• You receive an error message.
• The e-mail message is not sent.
• The e-mail message is not saved to the Drafts folder. Continue reading ‘Microsoft Outlook Interface not registered error’