Outlook 2016 oab not updating in cached mode

To manually update an OAB, see Use the Exchange Management Shell to update offline address books.

You can create additional organization mailboxes to generate OABs.My computer slows down when Outlook shows the "Updating Address Book" status. In computers with slow hard disk drives, such as portable computers, or running Outlook in a Virtual machine, the process of updating the address book can slow down the computer if the hard disk is fragmented.To improve offline address book download performance, try defragmenting your hard disk.In fact, Outlook cached mode will continue to download the offline address book every 24 hours regardless of whether the option is enabled.Note: To locate this option, follow these steps: On the Tools menu, point to Send/Receive, point to Send/Receive Settings, and then click Define Send/Receive Groups. When you click to select the Download offline address book check box and then click Address Book Settings, the Offline Address Book dialog box appears.

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