when converting leads into accounts, notes that have been entered in the lead's notes and activities notes field, do not get added to the accont that is created.
OOB Lead conversion functionality doesn't copy the notes. You can refer to the notes by viewing the deactivated lead. That said, you can achieve what you are after using a plugin. Refer
this
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Proposed as answer byMamatha SwamyMonday, January 13, 2014 5:04 PM