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Thread: Possible Workaround for Outlook 2007 Resource Calending

  1. #1
    SuperBeaker is offline Trained Alumni
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    Default Possible Workaround for Outlook 2007 Resource Calending

    Many users (including myself) have had a problem involving resources on Outlook 2007 and Zimbra. See, for example, Resource accepts even when busy

    Outlook 2007 appears to add two additional lines in the meeting invite that were not used in Outlook 2003. If you send an invite to a resource from Outlook 2007, you will see the following lines:
    Code:
    X-MICROSOFT-CDO-BUSYSTATUS:TENTATIVE
    X-MICROSOFT-CDO-IMPORTANCE:1
    X-MICROSOFT-CDO-INTENDEDSTATUS:BUSY
    From Outlook 2003, only that middle line (X-MICROSOFT-CDO-IMPORTANCE:1) is sent. By comparison, the following is sent from the Zimbra web client (which does not overschedule resources):
    Code:
    X-MICROSOFT-CDO-BUSYSTATUS:BUSY
    X-MICROSOFT-CDO-INTENDEDSTATUS:BUSY
    Our workaround is to tell postfix to scan incoming messages for the problematic lines and to ignore (delete) them. This was tested on CentOS 5.1 x86_64, zcs-NETWORK-5.0.6_GA_2313.RHEL5_64.20080522105815. Here's how:

    1) tell postfix to use body_checks
    Code:
    [zimbra@mailhost ~]$ postconf -e body_checks=pcre:/opt/zimbra/conf/postfix_body_checks
    2) edit the body_checks file. We want to delete (postfix uses the IGNORE command to do this) lines that match the extra lines sent by Outlook 2007
    Code:
    [zimbra@mailhost ~]$ cat /opt/zimbra/conf/postfix_body_checks
    #/filename=\"?(.*)\.()\"?$/
    #	REJECT For security reasons we reject attachments of this type
    #/^\s*Content-(Disposition|Type).*name\s*=\s*"?(.+\.())"?\s*$/
    #	REJECT Attachment type not allowed. File "$2" has the unacceptable extension "$3"
    /^X-MICROSOFT-CDO-BUSYSTATUS:TENTATIVE/  IGNORE
    /^X-MICROSOFT-CDO-INTENDEDSTATUS:BUSY/  IGNORE
    3) Restart postfix
    Code:
    [zimbra@mailhost ~]$ zmmtactl stop
    [zimbra@mailhost ~]$ zmmtactl start
    So far, we haven't found any other problems caused by this workaround. Give it a try and see if works for you.

  2. #2
    Rich Graves is offline Outstanding Member
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    Default

    Zimbra web client will send
    Code:
    X-MICROSOFT-CDO-BUSYSTATUS:TENTATIVE
    X-MICROSOFT-CDO-INTENDEDSTATUS:TENTATIVE
    if the user manually selects "Tentative." But snipping that for invites is arguably correct -- the invitee can decide between Accept and Accept/Tentative.

  3. #3
    stuartg.orion is offline Senior Member
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    Default

    Excellent! Thanks heaps SuperBeaker, that looks like a fantastic solution.

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