Question: is the old 10 euro note still legal

Answer: Yes, The ten euro note (€10) is the second-lowest value euro banknote and has been used since the introduction of the euro (in its cash form) in 2002. The note is used in the 23 countries which have it as their sole currency (with 22 legally adopting it); with a population of about 332 million. In September 2011, there were approximately 2,005,149,600 ten euro banknotes in circulation around the eurozone.