If you use plugins for your office suite, IE: Google App Sync, Data clean, etc, be caution with the likes of Office 2013. Microsoft is pushing a version called Click-To-Run.

If you need your plugins, please check carefully with your plugin provider to ensure it will work with this version of Office, and if it doesn’t work, stick with Office 2010 for a bit.

Nothing is worst then upgrading, only to find out it is unusable.