Legacy Outlook clients might require a manual update of the MAPI profile. Autodiscover and Exchange 2007 are described on Microsoft TechNet and an Autodiscover reference is available on Microsoft Developer Network. Outlook 2007 is redirected to the new server via Autodiscover. Outlook Web Access (OWA) automatically connects to the new Exchange mailbox server via the Client Access Server (CAS).
Pierre Bijaoui, Juergen Hasslauer, in Designing Storage for Exchange 2007 SP1, 2008 Database Portability and Clients With ISA 2004, you can set properties individually for each Web listener, thus, you can have different parameters for OWA, OMA, and ActiveSync. All network elements can be created “on the fly.” In addition, the OWA Publishing Wizard supports Outlook Mobile Access (OMA) and ActiveSync, which were not configurable via the wizard in ISA 2000. The ISA Server 2004 OWA Publishing Wizard walks you through the process of setting up a firewall rule that creates an OWA SSL VPN to your Exchange server. It can also be used solely as the front-end to an Exchange server, which is often done because using ISA server to front Exchange provides the best possible protection while providing the most functionality. ISA server can replace both a firewall and an Exchange front end server, reducing the exposure of the Exchange database while maintaining reliable connectivity. OWA is a specialized function of ISA Server used in Microsoft Exchange environments.
In Firewall Policies and VPN Configurations, 2006 OWA
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