Outlook stuck updating cached messages
Repeat these steps to re-enable it after deleting the Roam Cache folder and restarting Outlook.Contacts are not added to the auto-complete list until you send an email - importing the NK2 will not create contacts in Suggested Contacts.When Suggested Contacts are disabled, the Create Contacts For One Offs data value is set to 0 in the registry: Outlook won't populate the auto-complete cache automatically but it’s a fairly simple task for users. This method works in all versions of Outlook that use autocomplete. In all versions, it's an MRU - most recently used - list, so frequently used addresses will always be on the list.Open a new message and click the To button, select all of the names in the Suggested Contacts folder and add them to the message. Note that there is a limit to the number of names you can have on the autocomplete list. When Outlook 2010 doesn't save addresses to the autocomplete list, first try clearing the cache file, either with the button in File, Options, Mail or by starting Outlook with the /Clean Auto Complete Cache switch mentioned previously. If the problem persists, you'll need to delete or rename the Roam Cache folder found at C:\Users\[username]\App Data\Local\Microsoft\Outlook\Roam Cache (Windows 7/Vista).Users with Exchange mailboxes should switch to online mode before deleting the roamcache folder then re-enable cached mode after starting Outlook.This ensures the cache is cleared from the mailbox as well as the local ost.
Note that while this will stop Outlook from creating new contacts in the Suggested Contacts folder, it will not delete the contacts currently in the Suggested Contacts folder.
To use with other versions of Outlook that support auto-complete, change 14 in the path to the correct version number for your version of Outlook.
Suggested contacts is a "one-hit wonder" feature available only in Outlook 2010 that creates contacts for addresses you send mail to when the address is not already in your address books.
If you prefer using a command line, switch, it's Clean Auto Complete Cache.
To use, close Outlook and in the Start menu, Search field or Run command (Windows key R to open) type or paste the following line and press Enter to run Clearing the auto-complete list only removes the addresses you see as you type in the To, CC, or BCC fields.
With the introduction of the auto-complete list in Outlook 2003, we saw many, many users who used the auto-complete list as their address book.