Crmthdb is the expected Thunderbird extension for Zoho CRM!
Combined with the zoho mail add-on, you will be able to send mails from your company mail account to Zoho CRM.
The Crmthdb Thunderbird extension lets you archive any inbound or outbound e-mail into Zoho CRM. Select the mail you want to archive, then click on the "Archive to CRM" button and you're done!
Just click on the "View ZohoCRM Contacts" button to display your address book directly inside a Thunderbird tab!
Click on the "Add to ZohoCRM" button to add the author of a received mail into ZohoCRM.
It will even guess and pre-fill the following field in ZohoCRM:
You provide your personal e-mail and ZohoCRM account directly in the extension. You stay safe as nothing is stored or sent outside of your computer or Zoho CRM.
You can even use the same ZohoCRM mail account for several users of your company!