Method 2: Delete a damaged e-mail message:
If the Inbox contains a damaged e-mail message, you must delete the damaged message. To do this, try to move the e-mail messages in the Inbox to a personal folder. If a message is damaged, you will not be able to move the message. For example, move a group
of messages to a personal folder. If the group does not move, try to move an individual e-mail message to the personal folder. After you determine which message is damaged, delete the damaged message.
Method 3: Repair theOutlook Data file (.pst) using the steps given in the links below:
Note: ensure to back-up theOutlook Data file (.pst) before using scanpst.exe
Important: ensure to close Outlook before using scanpst.exe