BB Curve :: Cannot Send Or Receive Emails From Hotmail

I stopped receiving emails from my hotmail accont to my phone yesterday and then had a message from blackberry saying I needed to validate my email, which I did fine and also registered my blackberry ID. However, I still cannot send or receive my emais and when I try to send it comes up with an error message: 'User account is in INVALID mode'. I did change my hotmail password the other day; don't know if this is of importance. In addition, I have tried to modify the email account set up on my blackberry but it will not allow me to access the current account settings or allow me to add a new account, the option just doesn't exist or appear, which had not been an issue up until now. I could, however, set up an enterprise account if wanted. I am not sure who to contact about this so thought I'd post here first...