Outlook 2013 isn't auto-updating Internet Published Calendar (webdav)

Using 2013 Outlook.  I shared by calendar by publishing to a WebDav server (hosted internally).    2013 will upload the .ics file 1 time to the server - it WILL NOT update the ics file.

In comparison, the same process with Outlook 2007 also uploads the *.ics file to the server.

However, when I press F9, Outlook 2013 will NOT update the *.ics file on the server, but Outlook 2007 WILL update the *.ics file EACH time I press F9.

Goal:  I would like to publish the IIS Webdev server publicly and share the link http://mycalendar.fqdn/calendar/<username>.ics to external vendors so they can see my free/busy time.  BUT - Outlook 2013 will not auto-update the *.ics file, and Outlook 2007 will update.  

...any suggestion?
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Dan McFaddenSystems EngineerCommented:
According to Microsoft, the file extension in the URL has changed to "*.vfb"

Link:  https://support.microsoft.com/en-us/kb/291621

Also, what version of Exchange are you using?

Dan McFaddenSystems EngineerCommented:
Also, Outlook calendar publishing to WebDAV reference link from office.com:

link:  https://support.office.com/en-ca/article/Publish-your-calendar-on-a-WebDAV-server-e50ef626-c879-4005-a3d4-a96c0efc851f

kevin_buchananAuthor Commented:
I opened a case with Microsoft.  Turns out it is a known bug. They just released a hot fix for it.


I have tested and it seems to work correctly with this patch. It was just released on 8/11/15

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kevin_buchananAuthor Commented:
I had to get the hot fix from Microsoft
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