Active Content In OL2000

0 Votes

Active Content In OL2000

We have recently moved all of our mail from POP3 onto an an exchange server, the change over went fine but now some users are getting an error message when they try to open/preview some of the old and new mail.

Error: This item contains active content that cannot be displayed in the preview pane. Open the item to readits contents.

Can anyone please help, is this an easy fix?