Remember how Microsoft recently dropped support for Office 2007? Well, I have some bad news for anyone still running Office 2011 for Mac: the company has dropped support for that suite of apps as well. As of October 10, Office 2011 for Mac will no longer receive security or feature updates.
Earlier this year, Microsoft said it had not even tested Word, Excel, PowerPoint, Outlook and Lync on macOS High Sierra, but some users on the web have reported that the suite is mostly functional on the new operating system.
Microsoft recommends users upgrade to Office 2016 for Mac, which is fully supported on macOS High Sierra. OS X 10.10 or later is required.