Mail Items Stuck in Archive Pending State

Hi,

I have some users who have some mail items that are in in an archive pending state which don't apear to archive or they don't appear to be changed back to normal mail items.

I added the the cancel operation (which was not enabled before) for them but they are unable to revert the items. I have tried out the steps as per article below but that has not made a difference.

http://www.symantec.com/business/support/index?page=content&id=TECH35618&profileURL=https%3A%2F%2Fsymaccount-profile.symantec.com%2FSSO%2Findex.jsp%3FssoID%3D1375690013536pZn3XpwPUV9A2X5wXchb9N3kq17S1pMdLkXCO

It only appears to be affecting 3 users at the moment but not sure as to why this is. The scheduled archive task appears to processes the affected mailboxes fine, it just when the users try manually vault items.

The environment is EV 9.0.1 with Exchange 2007 servers.

Thanks.