We have Exchange and Outlook 2010. I have an Accounts payable Shared mailbox used by 5 users. The shared mailbox wills top receiving mail for some users others it will not send ( it leaves the messages in the outbox) others will delete or move certain messages but when they do this others cannot see that this has been done and will see the deleted/moved messages still in the INBOX. On the user's Outlook I have made sure Cached Mode is not checked. I have renamed the OST for users and reloaded Outlook created a new OST I have created new profiles and reloaded Outlook to the new profile. Every time it seems to fix the issue temporarily but 1-2 days late the issue is back with various users. On OWA the mailbox is fine and no issues so it must be with the local users but it is odd that all 6 users seems to have issues at different times.