How to send word and other doc's?

Hi.
For business I send a lot of forms back and forth through email.
At present when i send a word doc. it is sent as an attachment and goes through Firefox which is the client I use and it is using Gmail.

However zoho is my preferred email for everything else.
Since most people simply use "Reply" to send back I have 2 emails I must check and often miss or am late for some important, "Respond ASAP", type of message.

How can I send doc's through zoho ?? And eventually eliminate Gmail which is not a very good one for staying organized.
I have looked and cannot see it.

thanks.
Brad.