I've worked for a non-profit that is officially Microsoft Office based, and our policy manual say all field staff (who provide their own laptops/computer hardware) need to be able to interact with MS Office file formats. I and an number of colleagues I know have used LibreOffice for years without ever having incompatibility issues with MS Office; for me its been at least 10 years since I've had MS Office on any of my machines... I run Debian or an old ThinkPad, and Mac OS X with MacPorts.