Problem in synchronizing phone with Desktop Computer

Hello everyone,
I'm using Black Berry 9300 phone from T-mobile. I'm facing problem in synchronizing phone with Desktop Computer. I've accidently selected the option of: 'Delete from Server'.
On an email which was spam, I'm getting synchronization problems since then. In this context, I would like to inform that I'm a POP-3 email user for my corporate email account and there is no EMAIL EXCHANGE Server.
Whenever I connect my phone with computer it says:
"Cannot Connect to Exchange Server, Please Contact Your Administrator or Verify You Have The Correct User Name & Password"
I just wanted to know, how to stop my phone in looking for a Exchange Server. My phone syncs perfectly with MS Outlook while no appointments are carried over to the phone.
I've posted this problem on other forums as well, but didn't get any response.
I urgently need to resolve this issue. Any help in this regard will be greatly appreciated.
Regards.
