To all concerned who may get this error in Outlook "Outlook could not log on. Check to make sure you are connected to the network and are using the proper server and mailbox name. The Microsoft Exchange Address Book was unable to log on to the Microsoft Exchange Server computer. Contact your system administrator if the problem persists." The fix was in KB268575 (Microsoft Knowledge base), it was a missing reg key in the registry under TCP/IP. A simple fix really, I exported from a good and ran the .reg file on the "bad" PC, all was good. Why the key (went away) is a yet to be determined mystery. Thanks to all who responded, Doug Stelley Network Admin. Olean General Hospital (716)375-7320 The question of whether a computer can think is no more interesting than the question of whether a submarine can swim. - Edgar W. Dijkstra _________________ Confidentiality Notice: The information contained in this message may be legally privileged and confidential information intended only for the use of the individual or entity named above. If the reader of this message is not the intended recipient, or the employee or agent responsible to deliver it to the intended recipient, you are hereby notified that any release, dissemination, distribution, or copying of this communication is strictly prohibited. If you have received this communication in error please notify the author immediately by replying to this message and deleting the original message. Thank you.