Outlook 2010 Calendar Folder property is empty – Microsoft Community:
I got word back as follows:
As of now, the product group has consolidated similar cases and
currently working on the fix for the Event 27 issue, which
is planned for the December 2013 Cumulative
Update. Timelines can change for a number of reasons, and if
a change does occur I will provide you with an update. You
can find information on the Cumulative Update release
schedule here: 953878.
We have also published documentation on the Event 27 issue
in Knowledge Base Article 2883156.