Unable to connect to Microsoft Exchange Server

I am unable to connect to Microsoft exchange server with outlook. I was successfully connected until my company did a "migration" to allow us more mailbox space. I am unable to use the auto configure. It asks me to manually configure but I can't seem to get the server address correct. I just get the yellow dot. I have asked someone else who uses a mac what their server address is but that address does not work. My company doesnt provide support for Mac. Any help would be appreciated.