Office 365, Email, Exchange, Offline Global Address List needs to be synchronized
Offline Global Address List needs to be synchronized. The GAL is not resolving contacts.
You can manually force Outlook 2016/365 to update the GAL by using the following steps:
- Click on File
- Click on Account Settings
- Select Download Address Book
- In the dialog box, check Download changes since last Send/Receive, and Choose the \Offline Global Address List.
- Click OK.