By default, Outlook only downloads changes. Forcing a full refresh often bypasses minor synchronization errors. Go to the tab.

When the Outlook download address book is not working, users typically experience issues where new contacts don't appear or an error message (like or 0x8004010F ) pops up . This happens because Outlook relies on the Offline Address Book (OAB) to access the Global Address List (GAL) while in Cached Exchange Mode. Common Fixes for Address Book Download Issues 1. Manually Force a Full OAB Download