Synchronizing your Outlook (cached) address book with the Global Address book may fix these discrepancies.Instances of mail that is bounced back to the sender may also be fixed.Please visit the document on How to turn on or off Cached Exchange Mode for (Outlook 2010, and Outlook 20).
I might have a problem with my Offline Address Book in Outlook.
For me, new colleagues are not showing up and the contact pictures aren’t displaying either.
Please use the steps below to update your Global Address Book.
In order for some GAL entries to show up properly you may need to turn off Cached Exchange Mode.
We have another server in the wings waiting to be deployed, but we need to address the problem in the meantime. If it does not, then it is the generation or distribution process that is failing. OWA reflects the information correctly, but Outlook does not. I have tried deleting the OAB files, but when I download the address book, it still has the outdated version.
I'm wondering if anyone has anyone has any tips that could help me address this issue. Are you using web or public folder distribution for the OAB? If you are on Outlook 2010, any reason you are still using public folder distribution?
This means that in the worst possible scenario, an update to the Address Book won’t become available to the user until 48 hours after the change.
This situation however is extremely rare since the default maintenance time on Exchange is at AM and updates and downloads are usually performed during working hours.
In this case your global address book will update each time Send/Receive is pressed. There are a lot of resources to help you become familiar with Office 365.
Check out Microsoft's FAQs for Office 365 (https://support.office.com/).
The Global Address Book (GAL) is a directory of available contact information for CUMC, NYPH and Columbia University faculty, staff and students.