This item cannot be displayed in the reading pane

Question

Hello all.  I've bene scowering the net trying to find a solution to this problem for over a month now and every solution I have found doesn't work.  Here's the low down.
It only happens on this client and not other outlook clients. Meaning the same person could open his email on another system and the views are fine.  OWA is also fine.  I'm pretty confident its not Exchange but Outlook on this system.  I get
two messages.
When receiving emails from a specific address that sends emails with audio attachements (shoretel's voicemail to email) the user gets "this item cannot be displayed in the reading pane"  There is no active content in these emails.  They are plain
text.  Next, when he sends a meeting invite to a specific person or receives an email from a specific person he gets "This item contains active content that cannot be displayed in the Reading Pane".  Here's what I've done so far.
I've deleted and reinstalled Outlook 2010 (pro plus)
I've deleted his profile and rebuilt it.  I've deleted the profile from the registry and reinstalled outlook 2010.
I've disabled all pluggins.
I've cleared the forms cache and made sure the forms view matches someones that's working.
and of course, rebooted.  I've found fixes for different versions of outlook but nothing I have found has worked.  Short of backing up to PST, nuking his mailbox, rebuilding it, and importing the PST i'm at a loss.  I don't think I need to
get that drastic if on another machine and on OWA it works fine.  Anyone have a clue as to what I could try?

Answer 1

Hi This is what worked for me:
Just to clarify in my case, any email that had a form attached, when I tried to open it, the actual email body was just blank.
I also realised I couldn't create new forms, I could see all the preloaded ones but couldn't open.
So this is the advise I followed:
Clearing the forms cache
The first thing you should try is clearing the forms cache. This will make sure that, in the case of using a custom form, the latest published version of your custom forms gets loaded again. In the case that you just uninstalled an application that was using
a custom form, it will purge this cached form and Outlook will try to load the original message form.
To clear the cache;
Outlook 2007 and previous 
Tools-> Options…-> tab Other-> button Advanced Options…-> button Custom Forms…-> button Manage Forms…-> button Clear Cache
Outlook 2010 and Outlook 2013
File-> section Options-> section Advanced-> group Developers-> button Custom Forms…-> button Manage Forms…-> button Clear Cache
It worked when I went back to previous email the attachment looked like it had gone, double clicked and it took a while to open as it needed to load new forms.
Do this before rebuilding or deleting a mailbox.  Also try SP2 if need be.