Italics are not to be used for any old thing. They are not like cologne that you can splash all over yourself. You don't want to overuse them and take away what little power they have. They are for emphasis or book titles, right? Maybe foreign phrases...maybe the words of Christ.
Please don't use them as the standard font formatting on documents or emails. Unless you are Jesus. Also, if you use italics for everything, you aren't allowed to use the abbreviation IMHO (Jesus...please feel free to do whatever you like).