Outlook 2016 cached mode global address book not updating
You can configure a registry key on your clients to simply keep the address book in online mode.
For more information on this key for Outlook 2003/2007/2010 please see: the only time you want to disable cached exchange mode is if your users run on a terminal services or Citrix shared environment where you do not want a copy of EVERY users mailbox downloaded and stored locally on the terminal server!
This is called the Offline Address Book and is being generated on the Exchange server.
Due to various synching schedules, it can take up to 48 hours before you could actually see a change in Outlook after a modification has been made on the Exchange server or in Active Directory.
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.
Even though Outlook is the last in the chain, it is often the first level where the troubleshooting takes place as usually this is where the request is coming from.
someone who just received a CUMC email account, a new student, someone who recently changed their directory information) please use the steps below to synchronize your computer's locally cached version of the GAL.
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When asking them "If your company has this requirement this doesn't mean you need to disable Cached Exchange Mode.In that case the whole OAB is being downloaded again.In a later section, it is explained how to modify this.If the nickname cache becomes corrupt, Outlook may not be able to identify recipients, may offer incorrect recipients, may send to an incorrect or old email address, or may send the message to the wrong person.You may need to: To delete a cached entry from Suggested Contacts in Outlook 2010/2013/2016: Note: In a clean Outlook 2013 installation, Suggested Contacts folder is no longer available, the folder is never created, and no suggested contact items are created.