Symptom: Outlook starts rejecting your attempts to send messages, and you see rejection messages like this example:
Your message did not reach some or all of the intended recipients.
Subject: Meeting with Ann Other
Sent: 20/01/2014 11:37
The following recipient(s) cannot be reached: 'ano23@sussex.ac.uk' on 20/01/2014 11:37
None of your e-mail accounts could send to this recipient.
This symptom indicates that Outlook's autocomplete cache (which is used to suggest addresses in the To:, Cc: and Bcc: boxes when you are composing an email) is corrupted.
Try clearing your autocomplete cache as follows:
Outlook will then generate a new autocomplete cache, and you should then be able to send emails again.
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This is question number 2626, which appears in the following categories: