Starting on February 9th, 2016, users who have Office 365 ProPlus 2013 installed will begin being prompted to automatically upgrade to Office 365 ProPlus 2016. This upgrade will roll out to Office 365 ProPlus 2013 users over time, so your update prompt may not starting appearing until several weeks after February 9th.
This upgrade will be 850 MB - 1 GB in size. Microsoft Support for Office 365 ProPlus 2013 will run until February 2017, so you do not need to immediately upgrade. Please note though that starting February 2017, all Office 365 ProPlus installations must be upgraded from 2013 to 2016. If you need assistance with this automatic upgrade, please call 325-HELP (4357).
If you do not have Office 2013 or 2016 installed and wish to install them, they are available through Office 365 here.
If you have installed Office 2013 through http://downloads.ou.edu, you will be unaffected by this upgrade. If you wish to upgrade to Office 2016, please see your purchase/download options on the downloads.ou.edu website.