While browsing, I came across this wonderful explanation for the above question, Hope it will be some use to somebody. . . Seriously, I knew that Catholic bible had more books, But I didn't know the reason. . . Now I know. The New Testament canon of the Catholic Bible and the Protestant Bible are the same with 27 books. The difference in the old testaments actually goes back to the time before and during Christ's Life. At this time, there was no official Jewish canon of the scripture. The Jews in Egypt translated their choices of the Hebrew scriptures into Greek in the second century before Christ. This translation of 46 books, called the septuagint had wide use in the Roman world because most Jews lived far from palestine in Greek Cities. Many of these Jews spoke only Greek.
The early Christian Church was born into the world. The Church, with its bilingual Jews and more & more Greek - speaking Gentiles used the books of the septuagint as its Bible. Remember the early Christians were just writing the documents what would become the New Testament. After the destruction of the temple in Jerusalem, with increasing persecution from the Romans and the competition from the fledgling Christian Church, the Jewish leaders came together and declared its official canon of scripture, eliminating seven books from the septuagint. The books removed were tobit, Judith, 1 Maccabees, 2 Maccabees, Wisdom ( of solomon ), Sirach and Baruch. Parts of exististing books were also removed including psalm 151 ( from psalms ) parts of the book of Esther, Susanna ( from Daniel as chapter 13 ) and Bel and the Dragon ( from Daniel as chapter 14 ).
The Christian Church filled with the Holy Spirit did not follow suit but kept all the books in the septuagint 46 + 27 = 73 books total.
1500 years later, protestants decided to keep the Catholic New Testament but change its old testament from the Catholic canon to the Jewish canon.
The books that were removed supported such things as
* Prayer for the dead ( tobit 12 : 12 ; 2 Maccabees 12 : 39 - 45).
* Purgatory ( Wisdom 3 : 1 - 7 ).
* Intercession of Saints in heaven ( 2 Maccabees 15 : 14 ).
* Intercession of Angels ( Tobit 12 : 12 - 15 ).
The books they dropped are also called the Apocrypha.
Source : Yahoo Answers