XADM: CDO Changed to Regenerate Public Free-and-Busy Message

The Collaboration Data Objects (CDO) 1.2.1 method for updating the system Free/Busy public folder message for a particular mailbox is modified with the following hotfix. If the hotfix is not installed, when an appointment is created, modified, deleted, and so on by CDO, the following processes occur to update the mailbox's free-and-busy information:

1. CDO entirely deletes the free-and-busy information contained in the MAPI property that is stored on the mailbox (usually referred to as the local free-and-busy map).
2. CDO regenerates the data entirely from the appointments in the calendar, and stores it back in the MAPI property that is stored on the mailbox.
3. CDO spawns a thread to update the mailbox's free-and-busy information that is stored in the system Free/Busy public folder.
4. The changes are merged with the existing free-and-busy message that is already stored in the system Free/Busy public folder for the mailbox.

With the hotfix applied, the following process occurs:

1. CDO entirely deletes the free-and-busy information contained in the MAPI property that is stored on the mailbox (usually referred to as the local free-and-busy map).
2. CDO regenerates the data entirely from the appointments in the calendar, and stores it back in the MAPI property that is stored on the mailbox.
3. CDO spawns a thread to update the mailbox's free-and-busy information that is stored in system Free/Busy public folder.
4. The existing free-and-busy message is removed, and a new, regenerated free-and-busy message for the mailbox is placed in the system Free/Busy public folder for the mailbox.

A supported fix is now available from Microsoft, but it is only intended to correct the problem that is described in this article. Apply it only to computers that are experiencing this specific problem. This fix may receive additional testing. Therefore, if you are not severely affected by this problem, Microsoft recommends that you wait for the next Microsoft Exchange Server 5.5 service pack that contains this hotfix.

To resolve this problem immediately, contact Microsoft Product Support Services to obtain the fix. For a complete list of Microsoft Product Support Services phone numbers and information about support costs, visit the following Microsoft Web site:NOTE: In special cases, charges that are ordinarily incurred for support calls may be canceled if a Microsoft Support Professional determines that a specific update will resolve your problem. The typical support costs will apply to additional support questions and issues that do not qualify for the specific update in question.

The English version of this fix should have the following file attributes or later:

Component: CDO


NOTE: Because of file dependencies, this hotfix requires Microsoft Exchange Server version 5.5 Service Pack 4.

Microsoft has confirmed that this is a problem in Microsoft Exchange Server version 5.5.