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"The message interface has returned an unknown error" error message when you try to send an e-mail message in Outlook

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This article was previously published under Q235116

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If you send a message, the following error message may be displayed:
The message interface has returned an unknown error. If the problem persists, restart Outlook.

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The message that you tried to send is addressed to a user or personal distribution list that does not reside in your personal address book or does not reside in the global address list.

This may happen if you log on to a mailbox and try to send a message that was previously addressed by using a personal address book for that mailbox.

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The user who created the original message must send that message from the computer where the personal address book that contains the personal distribution list is stored.

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More information

If you try to save the personal distribution list that is listed in the To field to your personal address book by clicking Add to personal address book, the following error message is displayed:
Cannot perform the requested operation. The command selected is not valid for this recipient.

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Keywords: KB235116, kbprb, , kbemail

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Article Info
Article ID : 235116
Revision : 9
Created on : 5/24/2007
Published on : 5/24/2007
Exists online : False
Views : 408