Version 16.43 and earlier versions of Office 2019 will work on High Sierra; however, it may be difficult to obtain them now that newer versions have been released.

Office 2016 will work, but Microsoft no longer sells it, nor supports it. If you can get an installer, you still need an authorisation/licence code to link it to your Microsoft account and activate it on your computer.

Office 2011 may not work properly on High Sierra. Does Microsoft Office 2011 work in High Sierra?

If these 2010 iMacs had been installed with Office in the years between 2016 and October 2020 (when support for Office 2016 ended), then you would not have this problem now. In short: it's a curious time in the lifespan of these Macs to decide that they suddenly need Office.

Realistically, if your company wants people to do their job, it needs to invest in some new computers and relevant software.

Hi

You need Office 2011 or 2008 for High Sierra. These products were delivered by disk, not download. You'll have to find an install disk along with a product ID that has never been previously used.

You might consider using LibreOfficeto replace Microsoft Office. LibreOfficeis a free, somewhat compatible desktop suite.

Microsoft has a free, on-line version of Microsoft Office at OneDrive.com, which is also a good substitute for users of older versions of Mac OS if you don’t mind the hassle of having to use the web. If your needs are light-duty, try Apple’s Office applications: Numbers, Pages, Keynote and Apple Mail.

Hi 

High Sierra is Mac OS version 10.13. Microsoft does not have a supported version of Microsoft Office for this version of Mac OS.

You might consider using LibreOfficeto replace Microsoft Office. LibreOfficeis a free, mostly compatible desktop suite. Microsoft has a free, on-line version of Microsoft Office at OneDrive.com, which is also a good substitute for older versions of Mac OS if you don’t mind the hassle of having to use the web.

I have Microsoft Office 2011 installed on 2011 and 2013 iMacs. Both Macs have been upgraded to High Sierra (macOS 10.13.3). I have not noticed any problems. The update shown in the image below is available from Microsoft Office for Mac 2011 14.7.7 Update. The publish date for this update was 9/7/2017, making this is a fairly current update.