Outlook anywhere connected but not updating

In order to fully understand why this works you need to grasp that neither the client nor the CAS really care about the site in which the CAS exists, they simply accept that they are able to connect and that the CAS the client is connected to is able to provide access to the mailbox.

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Whenever a failure within the CAS array (CAS failure, load balancer failure, etc.) occurs, the RPC endpoint does not change, thus Outlook will continue to attempt to connect to the RPC Client Access Server array.

All Outlook versions behave consistently in a datacenter switchover scenario as well, assuming you follow our guidance. Well, in a datacenter switchover, you change the primary datacenter RPC Client Access Server array DNS entry’s IP address to now point to the standby datacenter’s RPC Client Access Server array.

The Outlook profile’s RPC endpoint is the RPC Client Access Server array (or a specific CAS if for some reason you did not create an array, which you should have done, and if you don’t know why I will say again, read Brian’s posts).

Whenever a failure occurs within the DAG (database failure, server failure, etc.), the RPC endpoint does not change, thus Outlook continues to connect to the same RPC Client Access Server array.

A simpler way to look at this behavior is that Outlook always connects to the configured RPC endpoint (assuming it is reachable) regardless of the database’s However, the Outlook clients with an existing Outlook profile would continue to use the old RPC endpoint rather than the new RPC endpoint (even though Autodiscover detected the change).

This is because the old RPC endpoint does not return an ec Wrong Server response to the client.Outlook profiles created after the value change would use the new RPC endpoint.Prior to Exchange 2010, when you moved mailboxes across servers, the Outlook RPC endpoint would update to point to the Mailbox server (or clustered Mailbox server instance) hosting the database where the mailbox resides.After the mailbox move was completed, the Outlook client user would be prompted with the “The Exchange administrator has made a change that requires you quit and restart Outlook” dialog.After restarting Outlook, the client would be connected to the new RPC endpoint.Instead, clients connect to a set of services on the Client Access server (CAS) role and services within the CAS role access mailbox data using MAPI/RPC from the Mailbox server on behalf of the connecting user. Basically, one simple change was made such that all mailbox-related MAPI connectivity goes through the RPC Client Access service on the Client Access server role.

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