The Hebrew letters of the word "Moshiach" have the numerical value of 458. The word "shaliach" (emissary) is ten less--448. When one uses the 10 powers of his soul--wisdom, knowledge, understanding, kindness, strength, beauty, endurance, majesty, foundation, sovereignty--in the observance of mitzvot, he becomes an emissary for bringing Moshiach.
The name of our publication has special meaning. It stands for the name of Rebbetzin Chaya Mushka Schneerson (obm), wife of the Rebbe.