We have small business server 2003, and we have upgraded 3 of 24 users to Outlook 2007. One of the users has stopped recieving emails from certain people. And while I was standing there, and email came in was displayed and then 30 seconds later disappeared. Neither the client machine or the serverare putting out any errors or events in the event viewer as to why this would happen. The client machine does not have any anti-virus software that is protecting against emails (that is being done server-side). I've performed all of the updates including the kb updates for o2007 and sbs2003. I think I'm starting to go crazy. Any ideas? Brian

Hi, Can the missing mails be viewed using OWA? Check the view configuration of Outlook - maybe Outlook is configured to show only unread messages. Leif

I had actually tried that, and they were still gone. OWA shows exactly the same thing as outlook. We're throwing around upgrading to sbs2008 and hoping that would solve the problem. Not really a good way to do it, but... Brian

You may have probably looked at this but just in case. Since, you mentioned "from certain people", is it possible that the user has extra folders with rules in place that send the emailsdirectly to them?

Issue description: Messages from certain people disappear in a single users mailbox when the user upgraded the client to outlook 2007 Check info: 1. You said that therere 3 upgraded clients, issue was occurred only on one of them, right? 2. Based on your description, and we cannot see missing mails via OWA as well. Rules are a good possibility for the symptom as Gnakati said. Please uncheck all rules on the problematic outlook, and then check the issue Troubleshooting: 1. Please dont open problematic outlook, send a test mail and check it via OWA 2. Please try to install previous outlook on a testing PC, and set up problematic users mailbox profile, see if issue still persists Notes: In the methods above, we can check if the issue is caused by outlook