I am trying to release by mail some emails that were quarantined as they were unscannable.  When I try to release them I get a Quarantine error stating:

There was an error with the following item(s)

SYQ13acc2e01: c0090081

(this error comes from trying to release one at a time, if I select more than one the other items are also listed below with the same c0090081 error)

I would like any advice on how to release them successfully and also if anyone knows what documents are deemed unscannable so I can advise our user to change their process in order to avoid these being quarantined.  The files are a set of 4 zip files which have been split using winzip and contain embedded objects within a Word doc - they are essentially forms which have been completed and contain various objects including drop down menus and possibly macros.