How to Clear the Outlook Autocomplete Cache

Three Methods:Easy methodMore involved methodOutlook 2010 and above only

This guide will show you how to clear the Outlook autocomplete cache. There are 2 ways of fixing this issue: #550 5.1.1 RESOLVER.ADR.ExRecipNotFound; not found

Method 1
Easy method

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    Start typing the email address you would like to clear from the cache until outlook displays it .
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    Press the down arrow key to select the email address. Press the delete icon beside email.

Method 2
More involved method

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    Note: It will allow you to clear all the entries from the address cache. (outlook.nk2)
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    Close Outlook and make sure it is not running using the task manager.
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    Open Windows Explorer and Paste %APPDATA%\Roaming\Microsoft\Outlook into the address bar.
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    Delete the file Outlook.nk2.

Method 3
Outlook 2010 and above only

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    Go to File, Option, Mail, and then click on the Empty Auto-Complete List button under the Send Messages header.

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Categories: Internet Browsers