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Key features of supported email clients
Outlook 2013, 2011, 2010, and 2007 support email access, out of office reply set up, connecting to other mailboxes, creating message rules, configuring delegates, access to the global address list, restoring deleted items, and managing junk mail settings.
Entourage 2008 Web Services Edition is supported on a "best efforts" basis and does not provide all Exchange features.
OWA can be used to share your calendar or folders but not to configure delegates.