The first thing to note is those two extra years are "free".  So the customer will not miss out on anything in years 4 and 5.   Personally, I would replace the MX400 now.   Another option you could consider is using subscription licence instead of co-term licencing.  This allows you to use the same licence on a new box in the same family.  I'm starting to lean into subscription licenceing for larger customers because it makes doing hardware upgrades like this SO much easier. https://documentation.meraki.com/General_Administration/Licensing/Meraki_MX_Subscription_Licensing For example, if you licence an MX400 under a subscription licence, you could then swap out the MX400 for any of these devices with no impact: MX90-HW MX95-HW MX100-HW MX105-HW MX400-HW VMX100 vMX-L ... View more