Understand how long you can continue to use the Office 2013 version of Office 365 ProPlus
You can continue to receive updates for the Office 2013 version of Office 365 ProPlus until February 2017. After February 2017, there will be no additional updates for the Office 2013 version. Therefore, we recommend that you upgrade to the Office 2016 version of Office 365 ProPlus as soon as possible.
If you choose to continue to deploy the Office 2013 version of Office 365 ProPlus, you need to do the following:
- Continue to use the Office 2013 version of the Office Deployment Tool.
- Configure your configuration.xml file to use the Version attribute when you download Office 365 ProPlus.
- Make sure that your users’ computers are configured to get updates from a location on your internal network. You can configure this either by using the Office Deployment Tool or by using Group Policy and the Update Path policy setting,
Source: Prepare to upgrade Office 365 ProPlus to the Office 2016 version