Which single licensing solution can be used for the entire organization to meet their business goals?

Company Background

Corporate Information
Araba .Ltd is a net shopping company in London. The company build internet transaction platform to sell clothing by mail order. It has a subsidiary company which is named Higo in Huston.

Existing Environment

Existing Licensing Solution
Araba .Ltd has a Select Agreement that has two months validation term.
Higo independently selects the products that they license and purchases all licenses under an Open License agreement.
There’s no Software Assurance for their licenses in the entire organization.

Existing IT Environment
There’re more than 220 desktop computers in the Higo company. These desktops have Windows XP Professional. The desktops also run various editions of Microsoft Office.

There’re multiple servers in the Higo company. The servers run various operating systems, including Windows 2000 Server and Windows Server 2003. The Higo company uses Microsoft Exchange Server 2003 and Microsoft SQL Server.

There’re more than 220 desktop computers in Araba Ltd. The desktops have Windows XP Professional or Windows Vista Business installed. The desktop also run Office 2003.

Wide World Importers has 500 desktops. The desktops run Windows Server 2008 and SQL Server. Wide World Importers uses Exchange Server 2007, and Microsoft System Center Configuration Manager that uses a dedicated SQL Server.

Business Requirements
Planned Changes
Araba Ltd intends to set two new subsidiary companies in the following 2 years.

Higo has bought a new server which will run the latest version of Windows Server and Exchange Server.

Business Goals
Araba intends to achieve business goals below:
* Offer global management of licensing for all subsidiaries;
* Upgrade all products to the latest version;
* make users be able to find files and business data that is located in different line-of-business (LOB) applications throughout the whole company by providing Web-based search tools;
* Reduce costs and administrative overhead;
* reduce the administrative overhead for the deployment of desktop software and for the management of server software.

Question
Araba is considering using a single licensing agreement for the entire organization. Which single licensing solution can be used for the entire organization to meet their business goals?