Companies often require Microsoft Office to be installed on shared computers. If the system administrator installs it under their own account then it will use up one of their licences. It is possible to configure office 2013 (office 365) as being a shared computer and thus not using up one of your licences. This can be done using the office deployment tool: (https://technet.microsoft.com/en-us/library/dn782860.aspx).
However in my experience this tool can often produce random errors when configuring it.
The easiest way that I have seen to do it is to install office as normal from the office 365 portal, deactivate it and then when it is completed deactivate the install and then add a registry key for SharedComputerLicensing.
If you navigate to file > account then the product information should look like the screen shot below.
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