Many users (including myself) have had a problem involving resources on Outlook 2007 and Zimbra. See, for example, http://www.zimbra.com/forums/adminis...html#post58775
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:
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):
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
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
[zimbra@mailhost ~]$ postconf -e body_checks=pcre:/opt/zimbra/conf/postfix_body_checks
3) Restart postfix
[zimbra@mailhost ~]$ cat /opt/zimbra/conf/postfix_body_checks
# REJECT For security reasons we reject attachments of this type
# REJECT Attachment type not allowed. File "$2" has the unacceptable extension "$3"
So far, we haven't found any other problems caused by this workaround. Give it a try and see if works for you.
[zimbra@mailhost ~]$ zmmtactl stop
[zimbra@mailhost ~]$ zmmtactl start