The ACSAlerts.log file contains the following message:
"<F/B Receiver> (37995) Packet processing from Packet Queue failed. Packet ID: /o=Organization/ou=Organization Unit/cn=Recipients/cn=User, version: 1947. Code : 0x8007000e,Description : Not enough storage is available to complete this operation."
Republishing the Free/Busy for the specific user does not clear up the issue.
As this issue involves one particular user's Free/Busy information as indicated in the error message, have the publishing side do the following: