Assuming you mean the autocomplete cache, you need to delete it and start
over. if you really want to prepopulate it, use ingressor.
http://www.slipstick.com/problems/nicknamecache.asp

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Diane Poremsky [MVP - Outlook]
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> After about 3 years of totally ignoring every Outlook trick, today I
> decided
[quoted text clipped - 3 lines]
> never use) and replace it with a new "to" file. (since some of the names i
> use everyday now are not there). How?
If you don't want to use Ingressor, simply open your contacts in phone list view, select all, actions->new message to contact - once all the names are in the TO: field, simply press Ctrl+K to resolve them all. This should populate your nk2 file. Then delete the email without sending it.

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Milly Staples [MVP - Outlook]
Post all replies to the group to keep the discussion intact. All
unsolicited mail sent to my personal account will be deleted without
reading.
After furious head scratching, DJFEdder asked:
| After about 3 years of totally ignoring every Outlook trick, today I
| decided to clean up my Contact File. Now that I have everyones name,
| email, job and company correct I would like to dump my old "to" file
| (which has names I never use) and replace it with a new "to" file.
| (since some of the names i use everyday now are not there). How?
DJFEdder - 30 Sep 2007 14:21 GMT
Your amazing....tell your boss to give you a raise!
> If you don't want to use Ingressor, simply open your contacts in phone list view, select all, actions->new message to contact - once all the names are in the TO: field, simply press Ctrl+K to resolve them all. This should populate your nk2 file. Then delete the email without sending it.
>
[quoted text clipped - 3 lines]
> | (which has names I never use) and replace it with a new "to" file.
> | (since some of the names i use everyday now are not there). How?
Milly Staples [MVP - Outlook] - 30 Sep 2007 18:40 GMT
I wish the Governator were in a mood to give all state workers a raise, but that will have to wait until the contract is up in June of next year. However, I will pass along your request <eg> Glad it worked for you.

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Milly Staples [MVP - Outlook]
Post all replies to the group to keep the discussion intact. All
unsolicited mail sent to my personal account will be deleted without
reading.
After furious head scratching, DJFEdder asked:
| Your amazing....tell your boss to give you a raise!
|
[quoted text clipped - 19 lines]
||| "to" file. (since some of the names i use everyday now are not
||| there). How?