not valid character for Unicode

Hi,

Im trying to upgrade from 7.4 -> 8.1 but it is failing with Unicode
errors. The offending character is the greek character mu (often used
for micro). Here is an offending string "BµG@S" (in case it doesn't
appear in the email, the mu is between the B and the G)

Any ideas why this character is not valid in Unicode?

thanks for any help

adam


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