I have seen in a letter writing textbook (also many websites like this) while preparing for my English test that we should begin a letter like this :
I am writing to ...
I have not seen this format in the last few months that I have lived in an English speaking country. Is the above format considered old-fashioned?
The most common format I have seen is like this:
(They never say "I am writing to ...": they just start immediately.)
I am confused about which format to use in my work place to sound normal and at the same time stay polite.