Currently Being ModeratedOct 11, 2012 5:51 PM (in response to _Tony_)
You mayhave to check Hotmail support. Some types of their accounts do not work with mail client software liek Mail or MS Entourage.
It would help if you posted your Mac OS version and iMac model. If your iMac is 2006 or newer, we need to get you to a different forum, or the Mail section of the forum for your OS version.
This forum is promarilu for hardware support for iMacs made before 2006, although you can't tell it from the poorly-chosen forum title.