Retro Themed Office Suite

Hi everyone,

I’m looking for advice on how to achieve a retro or Aero-themed look for my office suite, specifically in Microsoft Office, ONLYOFFICE, or LibreOffice. I love the classic feel of older Word versions, but I’m aware that they have major security vulnerabilities.

I’d appreciate any tips on:

Customizing Microsoft Office for a retro look (themes, skins, etc.).
Finding or creating themes for ONLYOFFICE or LibreOffice
Any other recommendations for office suites that are actively updated

Thanks in advance for your help!