Cannot Delete Emails in Outlook

Hi,

Started having a problem after upgrading to SEPS version 

End users and myself are having problems deleting emails from Outlook, sometimes it is a legitimate email (scans from a network MFP) but now we have started to see emails with zipped viruses attached are not able to be deleted.

 A dialogue box stating 'Unknown Error' is shown.

This only happens for some emails, I think it's related to the Endpoint Protection, anybody else seen this and/or have a fix?

Thank you

The Green Penguin