When you use Microsoft Outlook 98 or Microsoft Outlook 2000 to schedule a meeting, you may not be able to view the availability information for the attendee that you invited.
Outlook reports that no information is available for that user.
The issue is caused by a coding error. To resolve this problem, obtain the latest service pack for Exchange Server 5.5. Q119591 How to Obtain Microsoft Support Files from Online Services Microsoft used the most current virus detection software available on the date of posting to scan this file for viruses. Once posted, the file is housed on secure servers that prevent any unauthorized changes to the file. This problem was first corrected in Exchange Server 5.5 Service Pack 4.