On July 7, 2007 Pope Benedict XVI issued an Apostolic Letter on the celebration of the Roman Rite according to the Missal of 1962. The following text is the USCCB translation.

Summorum Pontificum replaced the motu proprio Ecclesia Dei which laid out the old guidelines for when and where a priest may say the traditional Mass. The new guidelines stated that the Latin Mass "was never abrogated".

Cover Letter

Motu Proprio Summorum Pontificum