Select the Advanced E-mail Options button. To access the AutoComplete settings, follow the steps: Make sure that the Use Auto-Complete List to suggest names when typing in the To, Cc, and Bcc lines box is checked. Scroll approximately halfway down until you see Send messages. To access the AutoComplete setting, follow these steps: This section details how to enable or disable the AutoComplete feature. For more information about how to increase the limit, see the How to change the limit for the AutoComplete list section. If you have a larger nickname cache, you could also lose a larger number of cached entries if your nickname cache becomes unusable because of corruption. Because this configuration is untested, we don't recommend it. You can increase the limit for the nickname cache.For more information about how to do this, see the How to remove AutoComplete list entries one at a time section. You can proactively remove AutoComplete list entries that you no longer need.There are two general approaches that you can use to avoid this situation: So, you may find some names unexpectedly removed from your nickname cache. After you reach this limit, Outlook uses an internal algorithm to determine the best names to remove from the list. Outlook limits the number of entries that you can save in the AutoComplete list. The following sections provide information about the AutoComplete feature. The AutoComplete list for Outlook is specific to Outlook and is not shared by Outlook Web App (OWA).

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