Because you don’t have a corporate onedrive and don’t want folks to be urged to stick stuff on a personal cloud?
Follow this guidance to enter a regkey or use group policy:
http://www.uab.edu/it/home/component/k2/item/337-office-2013-recommendations
Disabling SkyDrive by using the Registry Editor
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- Launch the Registry Editor by opening the Run dialog box and entering regedit.
- When the Registry Editor opens, navigate to the following key: HKEY_CURRENT_USER\Software\Microsoft\Office\15.0\Common\SignIn.
- If the SignIn key doesn’t exist, create it by right-clicking on Common à New à Key à SignIn.
- In the right pane of the SignIn key, create a new DWORD value named SignInOptions.
- Double-click on SignInOptions and change its value to 3. To restore SkyDrive functionality, simply set the SignInOptions value to 0.
- Disabling SkyDrive by using the Group Policy Editor
- To use this method, you need to install the Office 2013 Administrative Templates. If you don’t have these templates, download them from the Microsoft Downloads Web site and install them.
- Once the Administrative Templates are installed, open the Run dialog box and enter gpedit.msc to open the Local Group Policy Editor.
- Now that you’re in the Local Group Policy Editor, navigate down the tree to User Configuration à Administrative Templates à Microsoft Office 2013 à Miscellaneous.
- Find the “Block signing into Office” option in the list of settings and double-click it.
- In the Properties window, click “Enable” and select the option “None Allowed.”