Use the Outlook Web App policy mailbox policy to create a custom level policy to manage access to features in OWA
Use the Microsoft Outlook Web App mailbox Policies to create Organization-level policies to manage access to features in Outlo OK Web App.
See Microsoft Links for details:
http://technet.microsoft.com/en-us/library/dd335142 (v=exchg.150). aspx
In a nutshell, when we close a feature in the OWA virtual directory, the OWA feature is not available to all mailbox users in the company, and sometimes we just want someone or a department to be unable to use the features in OWA, then we can use Outlook Web App Policy.
For example, we find OWA in the virtual directory, and then double-click
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After double-clicking we navigate to the function, where we can turn off or enable OWA, but the closure here will affect all users in the enterprise
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For example, by default, Exchange SP1 automatically creates a default policy that turns on all OWA functionality, but does not apply to any mailbox
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This is Microsoft's note
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Below we directly edit the default policy, the calendar and task functions to cancel, and then save
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We select the user a001 in the recipient and select "View Details"
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For example, if no OWA policy is used by default, we select "Browse"
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Then select the default policy and select Save
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A001 Login OWA will not see the calendar and task features
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We can see calendars and tasks using the mailbox user a002 login, because he doesn't apply the default policy
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Exchange 2013 Learning (vii), Outlook Web App Policy