Multitude of reasons: * your documents cannot leave your company network, * you need features not supported by gdocs, * you need to work offline, * you need

Multitude of reasons: * your documents cannot leave your company network, * you need features not supported by gdocs, * you need to work offline, * you need 100% compatibility for produced files, * (fill in your favorites) Lack of MS Office (non-365) availability for Linux is quite a barrier to Linux adoption in more places.