This improvement ticket is to track adding support for Office 2016 for Office Connector in future versions of Confluence.
Presently, editing documents in Office 2016 is not supported due to limitations in WebDAV with some Office file types and browsers.
Some combinations of browsers and office files types work, however there is not a clear solution to make this work across all file type and currently supported browsers.
Thank you for your patience on this issue.
We are pleased to announce that the new Edit Files experience is here. From Confluence 6.11 (release notes). Now, you can edit any file attached to a Confluence page using your preferred desktop application, then save the file back to Confluence automatically. The new Atlassian Companion app works across Windows and Mac operating systems with any of our supported Browsers.
Victoria Li | Product Manager - Confluence Server