We experienced a failed drive on our Raid 5 on Friday, and replaced and rebuilt the array. Everything looked fine, but we soon discovered that were no longer able to receive messages in Outlook. We were able to send with no errors or bounces, but they too were not reaching their destination. We're still able to see our public folders and calendars, as well as any existing messages/folders in each respective user's mailbox.
Outlook is also showing each user as "connected" to the server.
The messages appear to be getting stuck in our local delivery queue, and our end users are getting Delivery Status Notification Delays and Failures.
Usually these problems go away after a reboot, but not in this case. I've tried starting and stopping various services, SMTP, etc. forcing queue connections, freezing/unfreezing, as well as reinstalling MS Exchange and service pages, all to no avail.