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Problem

When I try to send an email to someone I know works here, it bounces back with an error.  

Background information

If the employee left and has returned, then the Outlook entry "looks" the same" , but internally the ID UID is different, therefore the original UID is no longer valid.

Solution

To resolve this issue you should remove the old entry that is auto filled in Outlook and find the name again in the address book.  After sending a successfull email once, there should be no further issues.

1. Open a new email in Outlook
2. Start typing the name of the employee
3. When it pops upOutlook shows the options, click on the little "x" beside to the name to delete it
   
4. Now search for the name again by typing the first name and then pressing Ctrl + K
5. Find the name in the list and click OK
   
6. Send your message like normal

You should have no further issues.