Hi, Outlook is not a mail server ; Outlook is the mail client that connects to the server and fetch messages. If you want to know which server Outlook uses, you have to go to the account's properties to see how it is configured. It can be Exchange Server ; in that case you can reconnect a mailbox, whose original user has been deleted, to another user (this one must not have a mailbox already). It can be a POP3 or IMAP account stored on a local server, or hosted by a provider. But the best way to collect useful data about your mail system would be to ask the one that set it up, or, if he/she's not working there anymore, to read the documentation he must have left. I kindly suggest you to study the mail system of the company you're working for very seriously before attempting to have any action on it ;)