Synchronising Zoho mail with Iphone

Hi,

Now that IMAP is publicly available (Thank you), I have implemeneted it on my iphone and I can see all new emails as the come in BUT

On the iphone, I can move these emails into folders and delete some as well. These chnages are not reflected back into my zoho email account.

Eaht am I doing wrong? Or is this not the way it is supposed to work?

Thanks
Dan