exchange 2013 sharing calendars

I need to allow all people in the domain to have the ability to view everyone's calendar. 2013 does not allow this, how can I make this happen?
davidummelAsked:
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Md. MojahidCommented:
You'll need to change the permissions for the "Default" user for each mailbox.
The default read-only levels for Calendar Permissions are "AvailabilityOnly" which translates to 'Free/Busy' in Outlook.
The next level of access is "LimitedDetails" - which translates to "Free/Busy time, subject, location" in Outlook.  This is probably what you want and what has been put into the script below.
The highest level of read-only permissions is "Reviewer", which means you can see all details in the users calendar.

Ref:
http://www.experts-exchange.com/Software/Server_Software/Email_Servers/Exchange/Q_28396817.html
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