Ref: Outlook 2003/07/10 with RPCClientAccessServer

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http://technet.microsoft.com/zh-tw/magazine/ff626260.aspx

Client Creation

Q: Do you have any best practices to share for creating an Exchange 2010 CAS array in an Active Directory site?

A: I’d advise you to create the CAS array before you make any Mailbox databases or move any mailboxes to an Exchange 2010 Mailbox server in a site. Exchange 2010 Mailbox databases have an attribute called RpcClientAccessServer. If there’s no CAS array in the Active Directory site when the database is created, this will be populated with the server FQDN of an Exchange 2010 CAS server in the Active Directory site. If you create the CAS array before any Mailbox databases, this attribute will instead be given the FQDN of the CAS array as shown in Figure 2.

alt

Figure 2 RpcClientAccessServer attribute on a Mailbox database.

Why is this a good idea? The Outlook client (whether Outlook 2003, 2007 or 2010) won’t pick up the change automatically. If you use Outlook 2007 or 2010, you can have the profile updated by making the old RPC endpoint unavailable or by performing profile repair. But Outlook 2003 can’t change the endpoint and doesn’t include a profile repair feature. That forces you to go in and manually change the profile by removing the username, adding it back and then clicking the “Check name” button). This isn’t ideal by itself, and it also involves end users, so you really should create the CAS array beforehand.

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