How do I choose a domain name?
Applies To: Windows Storage Server 2008 R2 Essentials
Choose a name that uniquely identifies your home or business server. For example, if your business name is Contoso Ltd, you might choose Contoso to uniquely identify your business server on the Internet. If the domain name is not available, try another variation of that name, or perhaps something completely different.
The name you type can contain the following:
63 characters maximum
Letters, numbers, or hyphens (-). The name must begin and end with a letter or a number.
Domain names are not case sensitive.