[@Al Gee] First, ONLYOFFICE is highly compatible with MS Office formats which is very important given that a lot of companies continue to use this office suite. At the same time, it offers the support for OpenDocument formats as well. Second, the tab-based interface that allows you to open text, spreadsheet, and presentation in a different tab of the same window without switching between applications. And finally, it allows you to switch to the online mode and gives you access to the set of collaboration tools, like real-time co-editing, chat, etc.