Cyrus said:
How can I keep outbox from emptying automatically?
Don't schedule mail polls. When the mail is successfully received by
the mail host, Outlook is going to delete the copy from its Outbox
folder (and move it to another folder, usually Sent Items). If you
disable the scheduling of mail polls, you'll have to manually initiate
the mail poll when you want to send items sitting in the Outbox folder
as well as check for new items to receive from your mailbox up on the
server.