Emails are disappearing in Outlook 2007

Emails are disappearing in Outlook 2007

I recently set up my zoho mail in Outlook's 2007 version. At first, everything seemed OK and worked just fine.  My emails were all there and accounted for, but as soon as Outlook attempted to Send/Receive new emails, all of my emails disappeared from the inbox and subfolders.  I closed out of Outlook and re-opened, and all the emails had returned, but again, as soon as Outlook automatically tried to send/receive the 1st time, they all disappeared again.

The problem also occurs when I click on my sent folder and return to the inbox.  Every time I do that (before the first send/receive), it wipes the inbox clean.

There is never an error message.  The emails are just gone until I close Outlook and re-open.