Unable to access ms crm after the Import of Organization

In general, when we access ms crm through web browser using  http://MyCrmServer:Port, it automatically points to the default organization as http://MyCrmServer:Port/DefaultOrganizationName/loader.aspx

If we import an organization in crm, then we need to consider the following cases.

Case-1: If the installed MS CRM is a Professional Edition

Here Professional addition supports only one organization. So, as soon as we import an organization the old organization gets deleted and new organization becomes the default organization. So if we access http://MyCrmServer:Port, it points to the new organization.

Case-2:  If the installed MS CRM is an Enterprise Edition

Enterprise edition supports for multiple organizations. So, if we import an organization, both the organizations are present and the new organization will not become the default organization. So, to access the new organization the url is

http://MyCrmServer:Port/NewOrganizationName

Even if we set the new organization as default it is unable to resolve.

If we no more need the old organization then simply by disabling  and deleteing it makes the new organization default and everything works fine with this url

http://MyCrmServer:Port