Exchange Server 2007 Standard English 5-User CALs
By Microsoft

Licensing - License Type: License - License Quantity: 5 User CAL - Language Support: English - Software Name: Exchange Server 2007 Standard CAL - License - Platform Support: PC - Operating System Support: Windows - - ... 

Exchange 2007 Server Standard 64-Bit English with 5-Clients
By Microsoft

For most businesses today, e-mail is the mission-critical communications tool that allows their people to produce the best results. This greater reliance on e-mail has increased the number of messages sent and received, the variety of work getting done, and even the speed of business itself. Amid this change, employee expectations have also evolved. ... 

Exchange Server 2007 Enterprise Windows-64 English with 25-Clients (CALs)
By Microsoft

For most businesses today, e-mail is the mission-critical communications tool that allows their people to produce the best results. This greater reliance on e-mail has increased the number of messages sent and received, the variety of work getting done, and even the speed of business itself. Amid this change, employee expectations have also evolved. ...