Zoho Mail/Contacts/Calendar Setup on ANDROID (HTC Sensation/T-Mobile)

I am trying to set up my Zoho mail up on my Droid. I've tried different methods as included on the Zoho website (for instance http://zsync.zohosites.com/Android.html). Nothing works.

I keep getting one of two messages:

(1) "Error- Failed to connect to the Exchange server settings."

(2) "Authentication failed. Please verify your user name/password."

This is extremely upsetting and time wasting because I've been over this a dozen times and the settings, user name and password are all correct.

I've checked with T-Mobile support. From their end things look good since the email/calendar/contacts sync is working perfectly with my Hotmail and my Gmail accounts.

Thanks in advance to anybody who can help me get this solved as quickly as possible!