Exclamation marks are most useful to indicate that quoted speech is especially emphatic, for example 'The policeman shouted "stop!". This is a way of conveying tone and emphasis in speech which may not come across well when it is writtedn down.

However if you are writing in your own words, they should be used with caution. In general professional correspondence should adopt a reasonably measured and neutral tone . The problem is that in written rather than reported speech it is not that clear exactly what emphasis they are adding and they can end up giving your writing a bit of a manic edge.

Also in written communication, especially in a professional context, there is an expectation that you take the time to use language a bit more carefully and concisely than you might in normal speech and exclamation marks may be seen as a bit of a crude way to add emphasis when you could just have got it across in your choice of phrasing.

There is also the fact that in the last couple of years they are increasingly associated with clickbate type trash internet pages 'What these 12 celebrities look like now will astonish you !' not to mention scam emails etc.

Personally I would leave them well alone except in reported speech.

Exclamation marks are most useful to indicate that quoted speech is especially emphatic, for example 'The policeman shouted "stop!". This is a way of conveying tone and emphasis in speech which may not come across well when it is written down.

However if you are writing in your own words, they should be used with caution. In general professional correspondence should adopt a reasonably measured and neutral tone . The problem is that in written rather than reported speech it is not that clear exactly what emphasis they are adding and they can end up giving your writing a bit of a manic edge.

Also in written communication, especially in a professional context, there is an expectation that you take the time to use language a bit more carefully and concisely than you might in normal speech and exclamation marks may be seen as a bit of a crude way to add emphasis when you could just have got it across in your choice of phrasing.

There is also the fact that in the last couple of years they are increasingly associated with clickbate type trash internet pages 'What these 12 celebrities look like now will astonish you !' not to mention scam emails etc.

Personally I would leave them well alone except in reported speech.