Firstly forgive me but there's no section for Microsoft products or Office, but other Apple users must be using Office 2011 for Mac and may know how to help. I recently reinstalled OS High Sierra on a rather cluttered hard drive, to speed things up by removing all of the unwanted junk of years, but when it came to reinstalling Office 2011 for. MS Office 2011 does not work on macOS 10.13 High Sierra, officially. Microsoft has already ended all support for this package and wants you to switch. Microsoft has announced in a support document that Office for Mac 2011 will not be supported under macOS 10.13 High Sierra. It doesn’t go as far as to say the software will not work, but hints.

See 'What version of Office am I using?' if you don't know what version you're on.

Ms Office High Sierra 2010

Is ms office 2019 compatible with high sierra

Ms Office High Sierra Full

Version of Office	Supportability
15.35 and later	Office 2016 for Mac is fully supported on macOS 10.13 High Sierra. If you encounter issues using Office 2016 for Mac, please send us feedback so we can address them. In Word, Excel, PowerPoint and OneNote, you can click on the Send a Smile icon in the top-right of the app. For Outlook, choose Contact Support from the Help menu.
15.34 and earlier	These versions are not supported on 10.13. In some cases, you may not be able to launch the Office apps. For example, users will see the following error message when attempting to launch Outlook 2016 ver. 15.34: If you installed Outlook 2016 ver. 15.34 or earlier, and are not being offered an update to 15.35 or later, download the latest Office 2016 for Mac Suite Installer here.

Version of Office

Supportability

15.35 and later

Office 2016 for Mac is fully supported on macOS 10.13 High Sierra.

If you encounter issues using Office 2016 for Mac, please send us feedback so we can address them. In Word, Excel, PowerPoint and OneNote, you can click on the Send a Smile icon in the top-right of the app. For Outlook, choose Contact Support from the Help menu.

15.34 and earlier

These versions are not supported on 10.13. In some cases, you may not be able to launch the Office apps. For example, users will see the following error message when attempting to launch Outlook 2016 ver. 15.34:

If you installed Outlook 2016 ver. 15.34 or earlier, and are not being offered an update to 15.35 or later, download the latest Office 2016 for Mac Suite Installer here.