The Court of Appeals for the Federal Circuit reversed an Armed Services Board of Contract Appeals decision holding the government breached an information technology contract's non-substitution clause because, under a proper interpretation of the contract, the government did not replace leased software after terminating the contract for convenience. The dispute arose from a blanket purchase agreement under which the government issued a delivery order to lease software. The government subsequently terminated the delivery order for convenience, which triggered the order's non-substitution clause and obligated the government not to replace the software with functionally similar products for one year after the termination. Although the government had not deployed the software, the ASBCA found the government's continued use of preexisting applications that were functionally similar to the leased software and an upgrade of two applications to enable web access constituted a replacement of the software during the non-substitution period (09-1 BCA ¶34,067).