Office 2016 for Mac is fully supported on High Sierra. Since October 10, 2017, Office for Mac 2011* is no longer supported Outlook For Mac High Sierra 10.13.3 As of September 25, 2017, macOS 10.13 High Sierra is publicly available for all Mac users to install.
Word, Excel, PowerPoint, Outlook and Lync have not been tested on macOS 10.13 High Sierra, and no formal support for this configuration will be provided.