In Commas^x, Business letters^x

I believe it is common to both varieties of English, Ahava, that a comma is used for informal greetings and a colon for a business letter.

'MH got me pretty good I think'-- no, I just mean you have caused me to change my position, MountainHiker. You wrote 'but the "If you were me/I..." construct is harder to explain,' and I agree. All I can think to do is set up a few sentences for comparison: Who is he? He is Jim. Jim is he who...

Hello from Japan. I am writing a business letter addressed to "Her Excellency Ms. (First name) (Surname)", and wondering what to do with the salutation. Should I write "Dear Madam:", "Dear Her Excellency Ms. (Surname):", or just "Madam:"? Also, should I use a colon or a comma?

Hi, you said I have a couple of questions about the grammer in a business letter I had to write for an English class. The first question is wether I should capitalize international sales manager and the second is if there should be a comma after Reid in the following example. EX-My name is Rachel...

I have a couple of questions about the grammer in a business letter I had to write for an English class. The first question is wether I should capitalize international sales manager and the second is if there should be a comma after Reid in the following example. EX-My name is Rachel Reid, and I...