When the Directory Server (LDAP) information is configured correctly in the account settings, the functionality is enabled for directory lookups, but Outlook will repeatedly display an error code 17768.
We have contacted Microsoft about this and This will also prevent direct GAL lookups.
Add a meeting or an appointment to a public calendar folder After you have subscribed to a public calendar folder, you can add a new event if you have the appropriate permissions from the folder's administrator.
Do any of the following: Subscribe to an Exchange public folder Send a message to a public mail folder If a public mail folder has been assigned an email address by the folder's administrator (a folder setting called "mail enabled"), you can send a message directly to the public folder.
This application has been developed by a third party and is not associated or affiliated with Microsoft Corporation in any way.
***If your Public Folders reside on Office 365 you may have experiences some issues recently.
Outlook prompts you for password after the computer wakes up after sleep With Outlook open, use Finder to select the Applications folder, then the MSOffice folder, then holding the Control key down select the Outlook "O" icon, and select Get Info from the list.
Within the Get Info screen presented, check the Prevent Nap App box.
I switched on the debugging and detected, that the subfolders are scanned and it seems that the parser didn't detect the contacts.