[Bug 1153556] [NEW] Invisible text/calendar attachments

[era]

Public bug reported:

I use Thunderbird in a mainly Outlook-dominated organization.  Since a
while back (after I installed XUbuntu 12.04?  After the organization
upgraded to Outlook 2013?) I no longer see any indication when emails I
receive actually contain an invitation.  I have multiple times received
messages which didn't make any sense until I did "View Source" and
discovered that they had a text/calendar attachment with an invitation.

I would like for there to be an option to view these in-line, or at
least an icon to indicate that there is an attachment.

I dislike Outlook and prefer to read my email in Thunderbird.  I do not
particularly want to install LIghtning or connect to the Outlook
calendar.  I cannot use an external calendar service because the
invitations I receive contain classified information.  I really just
want to see that there *is*  an invitation attached and I can take it
from there by other means.

** Affects: thunderbird (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1153556

Title:
  Invisible text/calendar attachments

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