Outlook 2003 and Exchange 2003. This problem is only happening to one user (that we know of). He has folders in Outlook setup under his Inbox. After he reads an email, he moves them into these folders. For some reason, some of his previously read email will randomly change to 'unread' in these subfolders. The problem does NOT happen to email left in his Inbox...only the subfolders. He does have a blackberry device, but blackberry looked at the issue and said it was not related to them, because the user is only syncing his Inbox, not the subfolders, therefore the BES is not touching these email. After looking at the issue, we do not see any pattern as to which email this is happening to...they are not all coming from the same location...they are not all in the same subfolder...We have run an OutlookFix and Repair on this user, but he is still experiencing the problem.Does anyone have any ideas of even what to check next....

Hi, I think that we firstly need to check whether it is a client side issue or server side issue. Please configure the user profile on a known good Outlook Client to check whether the issue can be reproduced. If the issue cannot be reproduced, we need to focus on the specific client. I suggest you recreate the user profile on the problem client and disable Outlook Add-ins to check the issue: Step 1: Recreate profile for the problem user Step 2: Disable third-party addins ===================== 1. Launch Outlook application.2. Click Tools --> Options, click Other tab.3. Click Advanced Options.4. Click COM Add-Ins button.5. Uncheck All Add-ins.6. Backup these registry entries and then delete them one by one. HKEY_LOCAL_MACHINE\Software\Microsoft\Exchange\Client\Extensions HKEY_LOCAL_MACHINE\Software\Microsoft\Office\Outlook\Addins HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Office\11.0\Outlook\AddinsHKEY_CURRENT_USER\Software\Microsoft\Exchange\Client\Extensions HKEY_CURRENT_USER\Software\Microsoft\Office\Outlook\Addins HKEY_CURRENT_USER\Software\Microsoft\Office\11.0\Outlook\Addins Note: If there is value in the above registry key, please export the registry key to backup and then remove the add-ins. If after removing all Add-ins, Outlook is working fine, you may add the add-ons one at a time each, to determine which particular add-on may have cause the issueStep 3: Check if 3rd party DLL files. ==========================1) Download Process Explorer from 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.5) Check if there are third-party companys add-ins. Mike