Hi Abdelkrim, The best way to keep upgrade cost down, is to do it often. That includes NOT skipping 4-5 big versions. A lot has happened. Especially if you are stilling using the Classic. So estimating the cost of upgrading from NAV 2009 to NAV 2017 is impossible to do, without both seeing the database and talking to the users. What is the objective of the upgrade? What new functions do you plan on using? What old functions/reports needs to be upgrade, which are no longer required. Top that with having to upgrade first to NAV 2013, then NAV 2013 R2 (sometimes the first is not required), before you're in the "new environment" in NAV 2017. The best you could do, to ensure not failing such a big upgrade, is to do it together with someone who have done it before. Your question or profile does not say if you work for a partner or end-user. If end-user, then find a partner to help you with this one. Even if you normally take of of maintaining it.
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