Punctuation question

[Ron Wilbanks]

Over the years, I have always used a colon on the open salutation of any letter, both personal and formal.  Lately, I have been receiving business letters that use a comma, rather than a colon addressed to my boss.  Likewise, I also see the use of the comma becoming far more widespread than the colon in this area.

Has the rules of writing changed, and now favor the comma for a salutation, or is the colon still the rule?  My boss, who is 54 years-old, uses the comma all the time, as does his 19 year-old daughter.


Sincerely,

Ron

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