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Shadow Distribution is a small, specialized film distribution company located in Waterville, Maine, dedicated to releasing unusual, great films. Founded in 1988, the company has distributed some of the best independent and foreign films of the last two decades, including THE WILD PARROTS OF TELEGRAPH HILL, LATCHO DROM, THE YES MEN FIX THE WORLD
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Say Her Name: The Life and Death of Sandra Bland. Searching...
- Educational Resources
Shadow Distribution is proud to present the US theatrical...
- About
Shadow Distribution is a small, specialized film...
- Sita Sings The Blues
Sita is a goddess separated from her beloved Lord and...
- Films
Shadow Distribution is a small, specialized film distribution company located in Waterville, Maine, dedicated to releasing unusual, great films.
- Overview
- OAB generation
- OAB distribution
- OAB planning and deployment
- Move OAB generation to another server
An offline address book (OAB) is a local copy of an address list collection. OABs are used for address book queries by Outlook clients that are configured in cached Exchange mode. OABs are the only option for Outlook clients that are disconnected from the Exchange server, but they're also queried first by connected Outlook clients as a way to help reduce the workload on Exchange servers. You can configure which address lists are included in an OAB, access to specific OABs, how frequently the OABs are generated, and where the OABs are distributed from.
By default, a new installation of Exchange creates an OAB named Default Offline Address Book on the server. This OAB is also the default OAB, which means it's the OAB that's used by mailboxes and mailbox databases that don't have an OAB assigned to them.
OABs in Exchange 2013 and later are improved over OABs in Exchange 2010. These changes were introduced in Exchange 2013:
•Only web-based distribution is supported (public folder distribution is no longer available). Web-based distribution allows:
•Support for more concurrent downloads by client computers.
•Reduced bandwidth usage.
OAB generation is controlled by the mailbox assistant named OABGeneratorAssistant that runs under the Microsoft Exchange Mailbox Assistants service. OAB generation occurs in a designated arbitration mailbox that has the OrganizationCapabilityOABGen value for the PersistedCapability property. An arbitration mailbox with this capability is also known as an organization mailbox.
By default, OABs are generated every 8 hours. To change the OAB generation schedule, see Change the offline address book generation schedule in Exchange Server. To manually update an OAB, see Use the Exchange Management Shell to update offline address books.
The arbitration mailbox named SystemMailbox{bb558c35-97f1-4cb9-8ff7-d53741dc928c} is the first organization mailbox in your organization. By default, this organization mailbox is responsible for generating all OABs (the first OAB named Default Offline Address Book, and any new OABs that you create).
You can create additional organization mailboxes to generate OABs. Exchange Server contains the improvements to OAB generation that were introduced in Exchange 2013 Cumulative Update 7 (CU7):
•You can configure multiple OABs to be generated by the same organization mailbox, but you can't configure an OAB to be generated by more than one organization mailbox. If you configured an OAB with multiple organization mailboxes, each copy of the OAB had a different unique identifier. So, a full OAB download was required whenever a client was proxied to a different organization mailbox location.
•You can configure an OAB to allow a read-only copy (also known as a shadow copy) to be distributed to all organization mailboxes in the organization (also known as shadow distribution). All copies of the OAB have the same unique identifier, so full a OAB download isn't required when a client is proxied to a different organization mailbox location.
By default, Outlook clients are configured to download the OAB every 24 hours, or users can initiate a manual download from Outlook at any time.
OAB distribution to clients depends on Internet Information Services (IIS) virtual directories and the Autodiscover service. The IIS virtual directory that's used for client access to OABs is located in the default web site in the Client Access (frontend) services on the Mailbox server, and is named OAB (Default Web Site). This virtual directory is automatically created when you install Exchange, and is configured to service internal clients at the URL https:// /oab (for example, https://mailbox01.contoso.com/oab). You'll need to manually configure the external URL that's used to distribute OABs to external clients. For more information, see Step 4: Configure external URLs in Configure mail flow and client access on Exchange servers.
In the properties of the OAB, you can configure the OAB virtual directories that are available to distribute the OAB to clients. The default setting restricts OAB distribution to the OAB virtual directories on the server that holds the OAB's organization mailbox. However, the Client Access services on any Mailbox server can proxy incoming OAB download requests to the correct location. Therefore, we recommend that you configure all OAB virtual directories to accept requests to download the OAB. For instructions, see Use the Exchange Management Shell to configure any virtual directory in the organization to accept download requests for the OAB.
The Autodiscover service advertises the OAB URLs that you've configured. Autodiscover is supported by all versions of Outlook and virtually all mobile devices that are currently by Exchange. Here's a summary of the OAB distribution process:
1.Outlook receives the OAB URL from Autodiscover, and connects to the Client Access (frontend) services on a Mailbox server.
2.The Client Access services on the Mailbox server that accepted the connection performs these steps:
Whether you use a single OAB or multiple OABs, consider the following factors as you plan and implement your OAB strategy:
•Th size of each OAB in your organization. OAB sizes can vary from a few megabytes to hundreds of megabytes. The following factors can affect the size of the OAB:
•The usage of certificates in your organization. The more public key infrastructure (PKI) certificates, the larger the OAB. PKI certificates range from 1 kilobyte (KB) to 3 KB. They're the single largest contributor to the OAB size.
•The number of mail recipients in your organization.
•The number of groups in your organization.
•User information that your organization adds to each recipient object. For example, some organizations configure full address and contact details for each user.
In Exchange 2010, moving OAB generation to another server required you to specify a different generation server in the properties of the OAB. But in Exchange 2013, Exchange 2016 and Exchange 2019, OAB generation occurs in a designed organization mailbox, not on a designated server. To move OAB generation to another server, you need to move the organization mailbox. For example:
•Move the existing organization mailbox to a different Exchange 2013, Exchange 2016, or Exchange 2019 server (you can't move the organization mailbox to an Exchange 2010 server).
•Configure the OAB to use an existing organization mailbox on a different server. For more information, see Use the Exchange Management Shell to change the organization mailbox that's responsible for generating an offline address book.
•Create a new organization mailbox on a different server, and configure the OAB to use that organization mailbox. For more information, see Use the Exchange Management Shell to create organization mailboxes.
Sep 30, 2013 · The model encompasses random shadowing effects due to signal blockage by hills, trees, buildings etc. It is also referred as log normal shadowing model. Figure 1: Simulated results for log distance path loss model. In the far field region of the transmitter, for distances beyond , if is the path loss at a distance meters from the transmitter ...
Feb 21, 2023 · Use the Exchange Management Shell to enable shadow distribution for offline address books. Before you enable shadow distribution to distribute a read-only copy of the OAB to organization mailboxes in different Active Directory sites, verify that an organization mailbox exists in each site.
Say Her Name: The Life and Death of Sandra Bland. Searching for the Wrong-Eyed Jesus. Silent Souls
Shadow Distribution, Waterville, Maine. 475 likes. Shadow Distribution is a small, specialized film distribution company located in Waterville, Maine, dedicated to releasing unusual, great films....
