Albert patrick of Warbirdsim announced the release of their P-51 Mustang for FSX. “……. Take control of your virtual skies with our new Mustang package. THE definitive work of one of world’s most thoroughbread fighters is now available for FSX. Already a legend and fast gaining accolades with real P-51 pilots, 10 aircraft and 3 variants are depicted in 1 package; the P-51B, P-51C & the Mustang III along with a section of different colors worn by the actual Mustangs & featuring authentic manuals and checklists, fly the legends that made real flying a legend….”.
More info on their web site.