Want to email an estimate to a contact not listed on the account? Tough... you can't!! You have to download the PDF and send from your email client.
Workaround: Send to the primary contact and just cc the other person.
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Perspective: using Zoho finance integration from within Zoho CRM which adds a new module that pulls in Zoho books data.
Original Zoho Books / CRM limitations post by Gaurav Sethi