Method for coupling online and internet services

A method couples online and Internet services. Previously, personalized services in particular (e-mail etc.) are only available from Internet service providers via the telecommunications network and RAS/RADIUS access and not via the public Internet. Now the ISP is equipped with an open Internet application platform (OIA) coupled so that the ISP customer can take advantage of an extended range of services compared to usual Internet customers, even during access via the Internet. The method permits e-mails to be re-directed from the ISP server with a known address to the OIA platform, in such a way that the customer can use these services world-wide via the public Internet using any terminal via any network. One example is the use of a T-Online e-mail account from the fixed network and mobile telecommunications network, from home, at work and while travelling via foreign telephone networks and local and foreign company networks/LAN access.