Parallels Plesk Billing was first released on November 14, 2002 as ModernBill 4.0 and has had 14 versions so far with the most recent being Parallels Plesk Billing 6.0.3.
ModernBill 4.0 November 14, 2002 ModernBill 4.1 ModernBill 4.2 ModernBill 4.3 ModernBill 4.4 ModernBill 5.0 ModernBill 5.1 ModernBill 5.2 ModernBill 5.3 Parallels Plesk Billing 5.6 Parallels Plesk Billing 6.0.0 Parallels Plesk Billing 6.0.1 Parallels Plesk Billing 6.0.2 Parallels Plesk Billing 6.0.3 
