I Have a Outlook issue that has been hunting me for last couple of the weeks. One of the users in the organization that is running outlook 2010 every week or so is unable to send emails. Recreating a profile usually resolves the issue but I have noticed that when that is happening his OST file is reaching maximum file size of 50GB. His mailbox is only 2GB and he does not have full access permissions to any other mailboxes. Currently he is running with cached mode disabled but I will need to know why is that happening.