"Default Custom Expiration Day" in each message

One day, my mail box suddenly show me the “Default Custom Expiration Day” in each message. But no action if the message is out of day. How come of the message? I don’t know how to control it! Any one can help me to remove it?

Details:

  1. Default custom expiration date suddenly occur in each message. (Located at the bottom of Sender’s date & time).

  2. Dialog box disappear when click “Change Custom Expiration” button in tools bar. It show an error “4416 Dialog Box cannot be used in this contect; a document must be selected”.

Many thank’s

Regards,

Franklin Wong