Old emails in Outlook client waiting to be archived ?

Hi All,

I'm using EV Version: 10.0.4.1189

May I know why in one of my Outlook 2013 user client, the email has grey box (archive) icon with a clock on it ?

"Emails get the placeholder icon (icon is a clock), and the message This item is being archived by Enterprise Vault , do not copy, move or delete this item."

It's been like that since 3 days but nothing is archived.

So how to remove that grey message everytime the user opened archived email ?

Thanks,