I did a search and found someone who narrowed their issue with the combination of Exchange 5.5 and Outlook 2003. No resolution was posted, but thought mentioning it may stir up some ideas. ________________________________ From: Wakelin, Frank [mailto:fwakelin@xxxxxxxxxxxxx] Sent: Friday, October 29, 2004 3:22 PM To: [ExchangeList] Subject: [exchangelist] Strange NDR http://www.MSExchange.org/ Anyone seen this (or something similar) before? A user receives this NDR after they accept a meeting request. The NDR is on the Accept response: This message could not be sent. Try sending the message again later, or contact your network administrator. The client operation failed. Error is [0x80004005-0x000456-0x000501]. The strange thing is after opening the NDR and clicking send again that response works. Also after doing that new meeting request responses now works are well... Difficult to troubleshoot a moving target... ________________________________ Frank Wakelin Network Analyst direct tel.: 604.640.4096 fax: 604.622.5911 fwakelin@xxxxxxxxxxxxx <http://www.blgcanada.com/nav/mainLogo.gif> Borden Ladner Gervais LLP 1200 Waterfront Centre 200 Burrard Street, P.O. Box 48600 Vancouver, B.C., Canada V7X 1T2 www.blgcanada.com <http://www.blgcanada.com/> WE INTEND THIS ELECTRONIC MAIL MESSAGE ONLY FOR THE PERSON OR ENTITY NAMED IN THE ADDRESSEE FIELD. THIS MESSAGE MAY CONTAIN INFORMATION THAT IS PRIVILEGED, CONFIDENTIAL OR EXEMPT FROM DISCLOSURE UNDER APPLICABLE LAW. IF YOU ARE NOT THE ADDRESSEE OR AN EMPLOYEE OR AGENT RESPONSIBLE FOR DELIVERING THIS MESSAGE TO THE ADDRESSEE, PLEASE NOTIFY US IMMEDIATELY BY TELEPHONE, PERMANENTLY DESTROY ANY COPIES YOU MAY HAVE AND RETURN THIS DOCUMENT TO US AT OUR EXPENSE AT THE E-MAIL ADDRESS NOTED ABOVE. ANY DISSEMINATION OR COPYING OF THIS MESSAGE BY ANYONE OTHER THAN THE ADDRESSEE IS STRICTLY PROHIBITED. WARNING: EMAIL MAY NOT BE SECURE UNLESS PROPERLY ENCRYPTED. ------------------------------------------------------ List Archives: http://www.webelists.com/cgi/lyris.pl?enter=exchangelist Exchange Newsletters: http://www.msexchange.org/pages/newsletter.asp Exchange FAQ: http://www.msexchange.org/pages/larticle.asp?type=FAQ ------------------------------------------------------ Other Internet Software Marketing Sites: World of Windows Networking: http://www.windowsnetworking.com Leading Network Software Directory: http://www.serverfiles.com No.1 ISA Server Resource Site: http://www.isaserver.org Windows Security Resource Site: http://www.windowsecurity.com/ Network Security Library: http://www.secinf.net/ Windows 2000/NT Fax Solutions: http://www.ntfaxfaq.com ------------------------------------------------------ You are currently subscribed to this MSEXchange.org Discussion List as: deea@xxxxxxxx To unsubscribe visit http://www.webelists.com/cgi/lyris.pl?enter=exchangelist Report abuse to listadmin@xxxxxxxxxxxxxx ##################################################################################### Only the individual sender is responsible for the content of the message, and the message does not necessarily reflect the position or policy of the Texas State Teachers Association or its affiliates.