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Can you please suggest variations on the opening phrase:

Dear so and so,

I am writing to inform you that

What I'm basically looking for are formal ways to simply state: I'm writing to tell you that!

any tips are greatly appreciated!

thanks!
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Hi,

Have you considered a more direct beginning?
eg
instead of
I am writing to inform you that the new system will be implemented on Friday.
begin by saying simply and directly
The new system will be implemented on Friday.

Clive
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Thanks Clive!

yes, I guess this is an option! But for some reason I always feel that I have to write something cordial at the begging, even when I know that it makes for a more long-winded and hence worst writing.
yeah, I mean "I'm writing to inform you you that" is not necessarily overly friendly! But I need that sort of crutch that introduces the body of the email in a polite manner. You get the idea!