Mail merge within Excel...not with Word

This is probably very simple and basic but, I want to do a mail merge within Excel and not use Word. I have a table of information...each row is a client....and I want to create a letter per row (or client) using the data in Excel. I did it last year but don't remember how.

I used the Name manager in Excel and named all of the columns. I then used those names in my letter but I don't know how to make it create all of the letters.

I tried to use Word out of desperation but it won't format my numbers the same as I have them in Excel.

Also, is there a way to mark this as urgent? Is there any chat rooms or instant chat helps?