Alacritech® Inc., the innovator of Dynamic TCP Offload™ data acceleration solutions that enable the highest performance and efficiency in networked systems, today announced a U.S. District Court granted Alacritech’s motion for preliminary injunction to prevent Microsoft Corporation (Nasdaq: MSFT) from making, using, offering for sale, selling, importing or inducing others to use Microsoft’s “Chimney� TCP offload architecture slated to be available in both the “Longhorn� version of the Windows® operating system and in the Scalable Networking Pack for Windows Server™ 2003.

Alacritech sued Microsoft in Federal District Court on August 11, 2004, alleging that Microsoft’s existing and future operating systems containing the “Chimney� TCP offload architecture uses Alacritech’s proprietary SLIC Technology® architecture. The suit is based on two of Alacritech’s fundamental patents relating to scalable networking, U.S. Patent No. 6,427,171 and U.S. Patent No. 6,987,868, both entitled “Protocol Processing Stack for use with Intelligent Network Interface Device.�