Absolutely love Zoho Writer, but often need to share files by email with people who are in the Office ecosystem. Downloading a file as docx, then sending it by email, getting the comments back, converting it to Zoho format, editing it, then converting it back to docx to send again is not a great way to work.

To be able to move fully to Zoho its really important to be able to natively support the docx, xlsx, pptx formats across your various products - i.e. allowing for me to work with them in your apps without converting them. These are after all the international standards for documents. Google has had this feature for years - and it is one of the main advantages over your stack.