If your Outlook address book has disappeared or is failing to sync, you aren't alone. This common glitch often happens after an update or when your local cached data becomes desynchronized from the server. How to Manually Download Your Missing Address Book
If the address book is missing from your list, forcing a manual download is the fastest way to restore it. download address book outlook missing
and navigate to the Send/Receive tab on the top ribbon. Click the Send/Receive Groups dropdown menu. If your Outlook address book has disappeared or