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When you have 1,000 names in the name cache (the maximum that Microsoft Outlook allows), and you start Outlook, there is a noticeable delay in displaying the drop-down list when you type a name from the cache.
This behavior occurs because Outlook loads the cache on startup.
To work around this behavior, either turn off the AutoComplete feature or delete some names from the cache.
To turn off AutoComplete:
On the Tools menu, click Options.
In the Options dialog box, click Email Options, and then click Advanced E-mail Options.
In the When sending a message group, click to clear the Automatic name checking check box.
To delete names from the cache:
In the Inbox folder, click New, and then, in the To box, type the first several letters of a recipient's name.
When the drop-down list appears, select names to delete, and then press DELETE.
Quit and then restart Outlook.
Microsoft has confirmed that this is a problem in the Microsoft products that are listed at the beginning of this article.