issues isa user createda calender invite.. and if he updates thecalender item later(simply added some text to the invite) some of theinviteeswere duplicated 2 and 3 times and many of the associates were listed as Optional userdid not list anyone as optional and did not duplicate the users 2 and 3 times what can cause this...in outlook 2007/exchage 2003 enviorment Dhruva

Hi, Firstly, please let me know whether I understand your problem correctly: After the meeting organizer updates his calendar item, in organizers calendar, some calendar invitees of the meeting are listed as Optional and duplicated 2-3 times. If I am off base, please let me know. At this time, would you please let me know? 1. Whether the issue can be reproduced? If yes, please let me know the detailed steps which you reproduce the issue. 2. Whether the issue only occurs on specific user? 3. If the issue occurs on a specific user, please check whether the user has any delegate configured. 4. Whether the issue still occurs on OWA In addition, I suggest you attempt the following method to troubleshoot the issue if you have method to reproduce the issue: 1. Remove delegate of the user 2. Disable third-party add-ins of Outlook 2007: Disable all the third-party add-ins of the Outlook 2007 ============================= A. On the Tools menu, click Trust Center. B. Click Add-ins in the trust center C. Then please select COM Add-ins and click go to open the com add-ins. disable all the com add-in items.D. Please come back to the add-ins window and select exchange client extensions and click Go, disable all the items.E. Please check the following registry key to make sure that there is no add-ins loaded in registry: a. HKEY_LOCAL_MACHINE\Software\Microsoft\Exchange\Client\Extensions b. HKEY_LOCAL_MACHINE\Software\Microsoft\Office\Outlook\Add-ins c. HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Office\12.0\Outlook\Add-ins f. HKEY_CURRENT_USER\Software\Microsoft\Exchange\Client\Extensions g. HKEY_CURRENT_USER\Software\Microsoft\Office\Outlook\Add-ins h. HKEY_CURRENT_USER\Software\Microsoft\Office\12.0\Outlook\Add-ins Note: If there is value in the above registry key, please export the registry key to backup and then remove the add-ins. Check if 3rd party DLL files exist =================================1) Download Process Explorer from the following site:http://www.microsoft.com/technet/sysinternals/Utilities/ProcessExplorer.mspx 2) Launch Outlook application.3) Run Process Explorer as administrator, accepted license. 4) Locate to outlook.exe, and select Outlook.exe, click view --> Lower Pane View --> DLLS, and then click Company Name to sort by company name.6) Check if there are third-party companys add-ins. 3. If the user has device such as BlackBerry need to access his mailbox to sync calendar folder, please temporarily disable it. After that, please check whether the issue can still be reproduced. If the issue still persists, please use MFCMapi tool to check the PR_Last_Modification_Time and PR_Last_Modification_Name attribute of the problem meeting in the users calendar folder: 1. Launch MFCMapi tool to logon the problem users mailbox (Online Mode) 2. Expand Root Container->Top of Information Store->Calendar folder 3. Open Calendar folder, locate the problem calendar entry and check the two attributes: PR_Last_Modification_Time and PR_Last_Modification_Name Mike