Exchange on mobile device: Deleted Emails still visible

Exchange on mobile device: Deleted Emails still visible

Hi, 

I am using zoho mail with a mobile device (Windows Phone 8 - Exchange Server Connection) and on my laptop in a Browser.

After moving some emails to subfolders at mail.zoho.com in a Browser (laptop), the emails are still visible on my mobile device (after sync). Any ideas how to solve this problem?

Thank you
Bud