Microsoft has released a fixed version of an earlier update to Outlook 2013 that had been pulled from distribution.
The update was released originally as part of September's Patch Tuesday updates. But within a few daysand . Users reported that, after applying the update, the Outlook folder pane disappeared. Removing the update reversed the problem.
The update affects only Outlook 2013 and is not a security update. According to Microsoft, it contains "stability and performance improvements."
This was not the only problem with this month's Patch Tuesday updates, and it was in fact part of.