Perestroyka years brought about intensive research into literary heritage of Russian emigration. However, Oleg Mikhailov began to return names and heritage of émigré writers much earlier, in the 1950’s. Oleg Mikhailov’s letters as a formal unity of documents were never published or systematized professionally. Fragments of these materials were parts of his works, including prefaces, articles, monographs, notes, and, most fully, memoirs, e.g. “The Prophetic Melody of Destiny” in 2008, the book conveying the idea of how rich and unique are the author’s archives. His correspondence contains first-hand materials, which make it an essential source of documents for scholars of Russian literature in exile.