Oab not updating

I would like to test modes of using address book, while Outlook is in cached mode. These methods depends on registry settings of Outlook (full article here: shortly: If the following registry key is present (XX.0 means office version – 15.0 for Office 2013), Outlook behaves upon the DWORD value inside: Download OAB DWORD supported values: 0 = The Offline Address Book does not download automatically.

1 = The Offline Address Book uses the Download Full Items download mode. 2 = Download the Offline Address Book in any download mode, but download a differential update in the Header only download mode.

In eariler versions, It has been taken care by the Exchange System Attendant Service. So far, we have seen the General information about the Offlien Address Book, Now let’s deepin to the process, How Offline Address Book(OAB) Generation works?

OAB generation is being controlled by the mailbox assistant named OABGenerator Assistant that runs under the Microsoft Exchange Mailbox Assistants service.

The OAB files are generated and stored in the designated Arbitration mailbox, so the destination for OAB download requests is the Mailbox server that holds the active copy of the organization mailbox.

The OAB files are copied from the organization mailbox to %Exchange Install Path%Client Access\OAB\ for retrieval by clients.

if your organization is big and OAB is more than 100 MB, It will consume more network and Exchange Server Utilization due to which it always recommended to keep the only one mailbox across Organization.

Suppose you have multiple Exchange data center locations and users are distributed across the locations, you can create the Shadow Copies of the OABs so that network traffic can be avoided.

Service Responsible for Offline Address Book(OAB) Generation: OAB Generation is taken care by the Mailbox Assistants Service.

it allows OAB Generation to run or pause based on the workloads of the Exchange Servers.

By default OAB is a point in time snapshot of global address list and it is used as cached source of information about Exchange recipients properties.

OAB is stored on Exchange servers (see my previous article and downloaded to client once Outlook is configured in Cached mode.

Welcome to Offline address Book(OAB) multi part articles, In this Series, we are going to learn the complete details of OAB on How it works.

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