I just transitioned from Exchange 2003 to 2007. Everything seemed to be working fine, but recently Outlook 2007 has given errors when trying to use the Out of Office Assistant. When trying to open this feature, the following message is recieved, "Your out of office settings cannot be displayed,because the server is unavailabe, try again later."
Outlook 2007 clients are connecting using RPC. What seems strange is that not all of the clients experience this problem. About 80% of the Outlook 2007 clients cannot open the Out of Office Assistant and 20% have no problems. When connecting remotely using a VPN, about 50% of the Outlook 2007 clients have the error and %50 work fine.
Please let me know if anyone has suggestions. Any help is greatly appreciated.