Outlook 2010 updates the global address list on its own but at its own pace. It will check for changes in the address book infrequently. You can force Outlook to update the address book by following a few simple steps.
- In Outlook, click the File tab
- Click Account Settings, then click Download Address Book.
- Uncheck Download changes since last Send/Receive, select Full Details, and choose \Global Address List
- A new version of the Global Address List will be downloaded. You will see a status window will open to indicate that the download is in progress. It will close automatically when the download is complete.