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So just to clarify, do you want a single user to be able to access all user's calendars or all users accessing all user's calendars?<br />
<br />
Have a look at: <a href="http://www.puryear-it.com/blog/2013/11/19/granting-permission-user-calendars-single-user-office-365/" rel="ugc">http://www.puryear-it.com/blog/2013/11/19/granting-permission-user-calendars-single-user-office-365/</a><br />
<br />
If the latter, the permission list of each user could get very large depending on the number of users and may affect performance (maybe).
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So just to clarify, do you want a single user to be able to access all user's calendars or all users accessing all user's calendars?

Have a look at: http://www.puryear-it.com/blog/2013/11/19/granting-permission-user-calendars-single-user-office-365/ [http://www.puryear-it.com/blog/2013/11/19/granting-permission-user-calendars-single-user-office-365/]

If the latter, the permission list of each user could get very large depending on the number of users and may affect performance (maybe).

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Greetings,<br />
<br />
&nbsp;I have an organization that would like the ability to view and edit calendar appointments for all users. This can be done individually inside OWA&gt;Calendar&gt;Sharing but it has be done for each user. <br />
<br />
&nbsp;Is there a policy I can craft that will allow everyone to access everyone's calendar to view and make edits? BTW, this has to be done inside Office365.
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Greetings,

 I have an organization that would like the ability to view and edit calendar appointments for all users. This can be done individually inside OWA>Calendar>Sharing but it has be done for each user. 

 Is there a policy I can craft that will allow everyone to access everyone's calendar to view and make edits? BTW, this has to be done inside Office365.

Calendar Sharing to Everyone on Office365

Office 365 is a group of software plus services subscriptions that provides productivity software and related services to its subscribers. Office 365 allows the use of Microsoft Office apps on Windows and OS X, provides storage space on Microsoft's cloud storage service OneDrive, and grants 60 Skype minutes per month. Office 365 includes e-mail and social networking services through hosted versions of Exchange Server, Skype for Business Server, SharePoint and Office Online, integration with Yammer, as well as access to the Office software. All of Office 365's components can be managed and configured through an online portal; users can be added manually, imported from a CSV file, or Office 365 can be set up for single sign-on with a local Active Directory using Active Directory Federation Services.

Microsoft 365

Exchange is the server side of a collaborative application product that is part of the Microsoft Server infrastructure. Exchange's major features include email, calendaring, contacts and tasks, support for mobile and web-based access to information, and support for data storage.