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What is the difference between Western European (ISO) and Unicode (UTF-8) character types?

I see that most all character types are set to Western Europe (ISO) (In our On-Prem Exchange and in O365 Exchange Online)  - Is there a reason for this? What implications would occur if we change it to Unicode (UTF-8)?
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John
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Depends on what character. ISO is single byte (256 characters) and UTF is multi-byte. If you are using only single byte  then you should not see a difference.
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I guess I don't understand when you say single-byte and multi-byte as well as what characters we use? The reason i'm asking is that we have an application that sends out emails. There is working in the subject line which contains the trademark symbol, which for some mail domains, get messed up. It was suggested that possibly changing the character type on our exchange server to Unicode (UTF-8) would fix that. We just don't know if that would also break anything as well.
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Thank you DansDad and John. This helped us decide what needed to be done.
You are very welcome and I was happy to help.
I've just noticed a 'typo' in my reply above; I stated:

'Latin Capital Letter A', at U+0041, is encoded in UTF-8 as a single-byte (decimal) 65, or (hexadecimal) A1 value; this is the same as the ASCII character code value.

This should have read:

'Latin Capital Letter A', at U+0041, is encoded in UTF-8 as a single-byte (decimal) 65, or (hexadecimal) 41 value; this is the same as the ASCII character code value.