Verdict: Partly
Partly. There is no Microsoft Office program you can install on Linux, but Word, Excel and PowerPoint all run free in a browser at office.com, and they open and save your existing files.
The desktop versions of Word, Excel and PowerPoint are written for Windows and Mac only. Microsoft has never made a Linux installer for them, and there is no sign of one coming.
What you get instead is Office for the web. Sign in with the same Microsoft account you already use and Word, Excel and PowerPoint open in Firefox or Chrome, free. Your files live in OneDrive and open in the browser the same way they do on a phone. The web versions handle everyday letters, budgets and slide decks well. They are thinner than the installed versions: complicated macros, some mail merge work, and a few advanced chart and pivot options are missing or simplified.
The easiest route for most people is to use the browser for anything that has to stay perfectly compatible with an office or a school, and install LibreOffice or ONLYOFFICE from your Linux system's app store for everything offline. Both are free and open .docx, .xlsx and .pptx files.
Nothing happens to your existing documents. They stay in OneDrive or on your drive and open in all three options. If you have paid for a Microsoft 365 subscription it keeps working, because the subscription covers the web and mobile apps as well as the Windows ones.
Free, installed, does everything Office does for home use. Menus and ribbons are laid out differently, so expect a week of hunting for things.
Your files: Opens and saves .docx, .xlsx and .pptx. Heavy formatting, tracked changes and macros can shift slightly when a file passes back to Office.
Looks closest to modern Office, with the same ribbon layout. Usually the gentlest change for someone who does not want to relearn anything.
Your files: Built around the Office file formats, so .docx and .xlsx round-trip with very little change.
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