Do the clients have the full-details version of the OAB cached to their clients?
When you make another change within those 15 seconds, then the timer is reset again.As now you could in theory hold off synchronization indefinitely, there is the maximum timer.This timer is started after the first change that you made and when it reaches 60 seconds, then a synchronization will occur to upload all the changes that you have made thus far, no matter how many seconds are left on the upload timer.*** NOTE: The GAL is essentially a real-time / online representation of AD Objects that are Mail Enabled for Microsoft Exchange *** The GAL contains information for all email enabled users, Distribution Groups, and Shared Mailboxes and Exchange Resource Mailboxes.GAL Objects are directly viewable in the Exchange Management Console/Shell and OWA and Microsoft Outlook BUT ONLY IN ONLINE MODE – The GAL will only present objects that have AD Attributes beginning with ms EXCH* (and some others) populated that it uses to filter on.You can help to control how often users download OAB updates by limiting how often you update the Exchange Server copy of the OAB.If there is no new data to synchronize when Outlook checks, the user's OAB is not updated." article may assit you - the OAB will only be updated every 24 hours by Outlook, or when Outlook is restarted, whichever happens sooner. The other option is to run cached mode but without the Offline Address Book. ” Well, the truth of the matter is that our new joiner Joe is in fact , an update to the Address Book won’t become available to the user until about 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." "After users have a reasonably current OAB downloaded to (or installed on) their computers, only incremental updates to the OAB are needed to continue to help protect users from otherwise unnecessary server calls to retrieve user data.Outlook in Cached Exchange Mode synchronizes the user's OAB with updates from the Exchange Server copy of the OAB every 24 hours.