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If your company has a global address book, you can handpick names to add to your contacts, which automatically adds them to your autocomplete list. Just click on Address Book, select the name, right click it, choose Add to Contacts and then Save & Close the contact to add it both to your Contacts and your autocomplete cache. Outlook keeps track of email addresses you have used in an Auto-Complete List. You can clear this list by clicking Empty Auto-Complete List. A confirmation dialog box displays to make sure you want to empty the Auto-Complete List.
You might have to re-import your suggested contacts. Open a new email message and click on the word To, next to where you would type email addresses. Use the dropdown box at the top of the window to select Suggested Contacts (if there is more than one, repeat the procedure for each).
Click on the top contact, then shift-click on the last to select all of them. Click the 'To' button at the bottom of the window, then press OK (all your contacts will now be in the to box).
At this point, the auto-complete list is updated. Close the message without sending.???