I assume you're referring to outlook.com using the feature that checks other accounts for you?
It's a free service and there is no support beyond a knowledgebase and forum, I think. However, if you know your account details for Tiscali, you can go ahead and configure it in a different mail client e.g. Outlook (the program) or Thunderbird. You will need some or all of your POP / SMTP / IMAP settings handy.