SYMPTOMS
The Calendar Connector may not refresh the data from a foreign system, even after the time-out period has expired, if you previously installed the fix that is described in the following Microsoft Knowledge Base article:
285809 XFOR: Calendar Connector Does Not Honor the Freshness Time-Out of the Free and Busy Data That Was Previously Retrieved
RESOLUTION
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: Calendar Connector
NOTE: Due to file dependencies, this fix requires Microsoft Exchange Server version 5.5 Service Pack 4.