Zoho Mail supports IMAP Access. You can configure the Zoho Mail Account in Outlook email client via IMAP. You need to select manual configuration and provide the following details in the Advanced Configuration Setup.
Incoming Server Details:
Server Name: imap.zoho.com
Port : 993
SSL : On
Outgoing Server Details: smtp.zoho.com
The outgoing server requires authentication and it is same as the incoming server.
For step by step instructions with images to configure Zoho Mail Account in Outlook, refer this page.