Google offers a service called Google Apps. With this service, you can use a branded subset of their products at a non-Google domain. For example, you could use Gmail with a bob@mycompany.com address.
Because Google Apps is largely targeted at business/enterprise customers, it takes a while for some new updates and products to make their way into it; presumably the lag time is so that the the paid product can be kept as stable as possible.
Because Google Apps is largely targeted at business/enterprise customers, it takes a while for some new updates and products to make their way into it; presumably the lag time is so that the the paid product can be kept as stable as possible.