I have a couple of address in my Outlook address book that I have either deleted or modified that still autocomplete when addressing an e-mail.
For instance, I have a contact of "MY Contact" with an address of firstname.lastname@example.org and subsequently change it to email@example.com. The next time I begin to write an e-mail to "My Contact", the address line "TO" will list the original firstname.lastname@example.org rather than the new address. If I right click on the address and select properties, it will show the new email@example.com.
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