ONLYOFFICE Docs v6.4 with conditional formatting, new scaling options, and WOPI protocol support
ONLYOFFICE Docs v6.4 released

Grammar

When using Document with UK English language, does it have all of the spell check and grammar available like that in in MS Word?

Hello OODocs.
Desktop Editors contains spell check feature only. We are planning to add grammar check, but I cannot provide you with exact time frames at the moment (bug number - 47553).
Sorry for inconvenience.