Password not accepted when logging in with IMAP from Thunderbird 3

Hi,
I have just set up my Zoho Mail account in Thunderbird 3 as per your instructions, using IMAP.
but when I check my emails with Thunderbird I get the following message:

"Login to server imap.zoho.com failed".

However, the same password works just fine when I log on to my zoho.com services (including email) using a web browser (Firefox).

I would be grateful for advice as to how to make it work with IMAP in Thunderbird 3.

Thanks in advance,
Sandra

My settings:
IMAP server: imap.zoho.com
Port: 993

Tunderbird asks for the password for my account <my user name>@imap.zoho.com

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