Do I need to uninstall my expired Microsoft Office?

[susanitaw]

Before installing LibreOffice?

[JohnSUN]

Why? You do not have free space on your hard drive? As for me, there can be only two reasons: this and hatred for Microsoft products.

[Hrbrgr]

You can see the installation conditions here:
https://www.libreoffice.org/get-help/install-howto/

[Emoh]

No. It is not necessary. Simply install the LibreOffice.