Change acount type from Outlook to Exchange

I’ve added my hotmail account as an outlook account in my em client, but now, I whish to change the type to exchange. Is it possible to change the account settings?
(I have a large number of emails, therefore it would be glad to keep the already synced mails and I would not risk to have them duplicate after a merge)

Sorry, it is not possible Hausi. The only way to do it is to remove the account which is setup as IMAP, and add a new one setup as Exchange.