How to get rid of prompts for credentials connecting to proxy Server officeimg.vo.msecnd.net in Office 2013?

I have found a solution, which works for now and which seems different from the regular solutions.

It basically asks to modify the registry entry.

The dword to add with a zero value is below

HKEY_CURRENT_USER\Software\Microsoft\Office\15.0\Common\Internet\useOnlineContent

Source

To ease the manipulation of the registry mentionned by @Firee, you can put that code in a file (disable_office_online.reg) and double click on it:

Windows Registry Editor Version 5.00

[HKEY_CURRENT_USER\Software\Microsoft\Office\15.0\Common\Internet]
"UseOnlineContent"=dword:00000000

To restore it (old value was 2 on my computer):

Windows Registry Editor Version 5.00

[HKEY_CURRENT_USER\Software\Microsoft\Office\15.0\Common\Internet]
"UseOnlineContent"=dword:00000002

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