I saw many times on forums or chats discussions the expression by the way.

I understood its meaning, but is it a familiar expression or could I use in professional documents or messages?

If it is not, what kind of expression would be similar but polite?


Professionally people do not use this. Some other alternatives are:

  • In addition
  • Furthermore
  • As well
  • Moreover

'Incidentally' could be the perfect formal substitute for 'by the way'.

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