Microsoft Exchange Add-in is causing 'form region could not be opened'

Microsoft Exchange Add-in is causing 'form region could not be opened'

User is using Outlook 2010 connecting to Exchange 2010, along with Lync
2010 with UM enabled. When she gets a voicemail, it should show up in her
inbox looking like an email with transcription and an mp3 of the
voicemail. When you open the voicemail ('email') it shows 'form region
could not be opened' in the preview pane. When she clicks on 'forward' to
create a forwarded message, the transcription shows up and the mp3 is
there.
In troubleshooting, I turned off the 'Microsoft Exchange Add-in' and it
made the preview appear - the problem was solved. I'm trying to find out
more about this Microsoft Exchange Add-in. There's not much that I've
found out there that tells me exactly what this add-in does. Can anyone
shed some light on what it's for? Will I run into any trouble by having it
disabled?