I am having the strangest problem on ONE of my Exchange 2003 server. All other servers in my infrastructure are functioning fine. At random, users on the affected MBX server will lose their ability to sync their mobile device, namely iPhones. Error Received: "Cannot Get Mail. Connection to the Server Failed" Also, whenever a new user is created and placed on the affected MBX server the ActiveSync connection will not work. Most existing users on the server seem to function fine. Here is the error that is logged in the event log. Event ID: 3005 "Unexpected Exchange mailbox Server error: Server: [mail.example.LOCAL] User: [john.doe@example.com] HTTP status code: [409]. Verify that the Exchange mailbox Server is working correctly." Strange thing is, i can go into IIS, browse the OMA directory with the user credentials and it works just fine. The only thing that i have found that corrects this issues is to move the affected mailbox off the server to a new mail store, then move it back onto the affected serer. This clears the issue and the phone is then able to Sync. I have been working on this for weeks and have not found a solution. I would appreciate any help/ideas that anyone can offer. Thanks, DEMPC -DEMPC

1. Havent come across this myself, but if moving users off to anoter store then moving them abck solves this, why not just create a no store and move all the users there.Sukh

Hi, From the problem description, I understand that IPhones users are unable to use the Exchange ActiveSync on Exchange server 2003. And I noticed that only the IPhone users are unable to connect to the Exchange server 2003. Based on the current situation, we need to do the test on the website: https://www.testexchangeconnectivity.com/ to verify the error message or error code you received on the webpage. At the same time, you could enter the URL: https://localhost/Microsoft-Server-ActiveSync in the IE browser on the Exchange server 2003 to verify the detailed error coded you received on the webpage. Meanwhile, there is a link for your reference: Title: iPhone and iPod touch: Exchange ActiveSync requires Exchange Protocol version 2.5 or later URL: http://support.apple.com/kb/HT2099 Thx, JamesPlease remember to click Mark as Answer on the post that helps you, and to click Unmark as Answer if a marked post does not actually answer your question. This can be beneficial to other community members reading the thread.