New versus old NONMEM

Dear, I would greatly appreciate your opinion on the following questions: What are the advantages of NONMEM7 with respect to older versions like V and VI? Is it still "acceptable" to use versions V and VI nowadays? Is there an "optimal" combination of NONMEM, compiler and operating system? Thanks, Koen Information in this email and any attachments is confidential and intended solely for the use of the individual(s) to whom it is addressed or otherwise directed. Please note that any views or opinions presented in this email are solely those of the author and do not necessarily represent those of the Company. Finally, the recipient should check this email and any attachments for the presence of viruses. The Company accepts no liability for any damage caused by any virus transmitted by this email. All SGS services are rendered in accordance with the applicable SGS conditions of service available on request and accessible at http://www.sgs.com/terms_and_conditions.htm