A Mediation Server requires only the .NET Framework installation. No additional server components are needed.
This section discusses the recommended minimum hardware requirements for Lync Server 2010 servers.
The Lync Server 2010 Mediation Server processor requirements are as follows:
• Dual processor, quad-core 2.0 GHz or faster
• Four-way processor, dual-core 2.0 GHz or faster
Lync Server 2010 is only a 64-bit application and requires a 64-bit–capable processor. This is generally not an issue with any modern hardware, but be sure to verify legacy hardware that supports a 64-bit operating system before attempting to use it for a Mediation Server.
The Lync Server 2010 Mediation Server memory requirements ...