The word mezuzah comes from the Hebrew word "doorpost".  Doorpost because that is where we place a mezuzah.  This is one symbol that many orthodox and not so orthodox Jews believe in.  It is a reminder of G-d's presence and G-d's mitzvot (good deed).

The words of the Shema (Deut. 6:4-9) and another passage, (Deut.11:13-21) ; is written on a parchment scroll . On the back of the scroll is written the name of G-d.  This scroll is rolled up and placed in the mezuzah case so that the first letter in the front of the scroll (the letter Shin) is seen to the eye.

The proper kosher scroll is handwritten in a special type of writing .  These are obviously more expensive and can run between ($30-$50), making them more costly than a mezuzah case in many instances.  A photocopied  printed scroll is used by many but this does not fulfill the commandment.  It is up to the individual to decide but the kosher scroll is the one that ultimately fulfills the good deed.

The mezuzah case with scroll is placed on the upper third right side of the doorpost and at an angle slanting inward towards the room or house.  It is nailed and the following blessing is recited: 

 Barukh atah Adonai, Elohaynu, melekh ha-olam
Blessed are you, Lord, our God, king of the universe

asher keedishanu b'meetzvotav v'tzeevanu leek'boa mezuzah
who has sanctified us with His commandments and commanded us to affix a mezuzah

A mezuzah is to be touched and thereafter kiss the fingers that touched it.  This gesture should remind us of the presence of G-d in his good deeds and to show our love and respect.

Finally, if you do make the decision of moving from your office or residence place remove the mezuzah(mezuzot).  The reason for this is that many people who have no knowledge of the great significance of this symbol may destruct or abuse it which will be a sorrowful event.

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