Outlook 2010 > othersMicrosoft provides better support for products too.
Google Docs, and Libre Office are inferior in many ways compared to Microsoft Office. Honestly, you would think that they would have caught up by now, but they simply can't when it comes to business. If Microsoft did something right then it was Office, and also selling it.Now, as to actually pay for Office? Not really, my uni gave it to me for free, and I also have an older version of office that was given to me from a job in the past.Edit: The biggest deal-breaker for me is the feature to allow me to create scripts. I had to work with scripts to make some projects on Excel faster and less of an issue. Google Docs only recently added support for that, and script support on Libre Office on Linux is a hit or miss.