Outlook - Delete Saved E-mail Addresses
Clear a single cached item
- Open Outlook.
 - Click New Email.
 - Start typing email address.
Click the X next to the address to delete it.
 - Click the To... button.

 - Find the name in the address book and double click it.
Click OK. This will give you a new cached name.
 
To delete ALL cached items
- Open Outlook.
 - Click File.

 - Click Options.

 - Click Mail.
Scroll down until you see the section, Send messages.
Click Empty Auto-Complete List.
 - Click Yes.

 - Click OK.
 
***Please note that screen shots may differ from device to device. These screenshots were taken on a Windows 10 computer using Outlook 2016***
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