Outlook Free/busy not functioning since CAS server was shutdown

Posted on 2011-05-12
Last Modified: 2012-06-27
Background: we have multiple HubCAS servers. One  had a self signed certificate (it was not use for OWA) that needed to be renewed. I ran "newexcahgnecertificate" to generate a new one. I verifed the certificate was present on the server. I then deleted the out of date certificate. I checked the server and found the certificate was not updating properly. I then restarted the server.

Ater the restart I got several notices that Outlook Webservices on this sever failed. Some users could no longer get any Free/busy information when they used scheduling assistant for a new meeting, only slashed lines. I then shut down the server as I did not have time to troubleshoot it then.

Problem:Now the users are still not able to get any free/busy information even with the one CAS shut down. They did not move to one of the two other CAS servers we have in our environment. Even after a PC reboot their Outlook client is still not finding one of the availble CAS servers.

With our all 2007 environment (see details below), I expect to be able to use the Availability service on the CAS servers but some Outlook clients are not functioning properly.

Any thoughts how to get these Outlook clients to find one of the available CAS servers to get the free busy information?

Environment: Exchagne 2007 SP1 servers on Win 2008, Clients are all Outlook 2007.
Question by:swfwmd2

    Author Comment

    Are you indicating that updating (removing them and having them recreate) the OAB files on the local PC will correct the Free/busy issue on some Outlook users?
    LVL 8

    Expert Comment

    by:I Qasmi
    EMC GUI.

    Offline Address Books are configured under “Organization Configuration” –> “Mailbox” –> “
    Offline Address Book

    Right Click properties and check web distribution is enabled or not if not then

    Enable “Web based distribution” and select all of the CAS servers (and their corresponding OAB (Default Web Site) Webfolder). As you can see, it is important that the CAS servers have a working OAB webfolder.  If not, the oab may not be available for download by end users.

    You can test if the oab folder exists by browsing to  
    You should get a 403 – Forbidden page.
    LVL 8

    Expert Comment

    by:I Qasmi
    Check if Enable Web based distribution is greyed out then you need to recreate it

    Author Comment

    In our environment we normally have 3 CAS severs. When I looked at the Org Config mailbox OAB, I discovered we only had  the OAB distrubuted to 2 servers. We did not have it distributed to the one CAS that went down. I then added the CAS server that was not there (even though it was down)

    Other research led me here:
    I tested the Autodiscover Connectivity in the Outlook client of one of the users that have a problem (with OL running, Rt click the Outlook icon in the notification area and click on Test E-mail AutoConfiguration) - the message on got was "Autoconfiguration was unable to determine your settings" when I ran this same test the results confirmed the correct al fo the correct URS for the following: Availablity Service, OOF, OAB and Unified Message Service.

    Is there  a way to force the Outlook client to get the correct Autodiscovery Connectivity? (I am trying to avoid deleting the Outlook profile on these users and having them recreate it)

    Author Comment

    Thank you
    LVL 5

    Accepted Solution


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