Publishing Outlook Calendars. What is the server-side setting for sync frequency?

Question

I'm working on a custom implementation of a server (VERY basic WebDAV) that accepts Outlook's published calendars.

Outlook seems to have a setting (see the screenshot below) where it accepts a parameter form the server that tells it how often to re-publish the calendar and that's the parameter I'm trying to figure out.

If the setting is not specified Outlook defaults to 60 minutes which doesn't work for me but I cannot find any information on what the parameter might be (I am aware that Outlook's settings can be adjusted within the UI but I need it done automatically via a response from the server). When using Wireshark I see that when first publishing the calendar Outlook sends a PROPFIND method to the URL of the server:

PROPFIND /path/to/url HTTP/1.1 X-Office-Version: 15.0.4771 Depth: 1 Content-Type: text/xml User-Agent: Microsoft Office/15.0 (Windows NT 6.3; Microsoft Outlook 15.0.4771; Pro) Host: example.com Content-Length: 114 Connection: Keep-Alive Cache-Control: no-cache  <?xml version="1.0" encoding="utf-8" ?> <D:propfind xmlns:D="DAV:"><D:prop><D:resourcetype/></D:prop></D:propfind> 

which then responds with an XML (I'm assuming this is where the setting would be, but cannot find any information on it):

<?xml version="1.0"?><a:multistatus xmlns:a="DAV:"/> 

I'm lost at this point and not sure where else to be looking after lots of Googling and traffic sniffing (of Outlook <->Exchange communications but none that I found seem to be using the non-default param). Any suggestion where would be a good idea to look for something like this?

Answer 1

There is no Outlook Server setting for frequency of polling. This setting is at the client end. On an email client "check for new messages" is used to avoid overloading the server with requests. See the MS Outlook website .