Zoho Calendar - sync with windows mobile 7.5

Zoho Calendar - sync with windows mobile 7.5

Hi I just created a zoho account and I am subscribing my calendar from a external source.

I want to be able to subscribe my zoho calendar on my winmo phone . I went through the setup as mentioned in http://zsync.zohosites.com/Windows.html

The problem I have is i get the following error

Not updated
 we're having a problem syncing your information. Try again later

Last tried about a minute ago
Error code : 8004010F