Microsoft says new Outlook can't open some Excel attachments

Microsoft is working to resolve a known issue that prevents some users from opening Excel email attachments in the new Outlook client.
XDA Developers on MSN

I replaced these 4 apps with OnlyOffice, and never looked back

Goodbye software giants, hello seamless document control ...
GitHub

React Renderer for creating Powerpoint File with React. It is a PPTXJS binding for react

It is a React App with a Button. You click on it and a PDF will display a preview. Internally it uses libreoffice. Please check it is installed on your machine.
XDA Developers on MSN

4 open‑source PDF tools that replace Adobe Acrobat for everyday work

PDF power without the monthly subscription ...