Extend the maintenance term for a covered VM-NS1MSGRID environment by 1 year once it has reached year 4 or beyond. Infoblox VM-MAIN-1550-NS1MSGRID-Y4+-21 is an extended Level 3+ maintenance entitlement for the virtual-machine scope named in its ordering code. It is a maintenance service term, rather than a hardware appliance, software license, or implementation engagement. The Y4+ designation matters when coverage is being continued after the first three years. Select this term for a VM-NS1MSGRID deployment that requires one additional year of the Level 3+ maintenance tier in its fourth or later year. The service is specific to the VM maintenance scope indicated by NS1MSGRID and should be matched to the covered virtual environment before activation. This SKU distinguishes itself within the Infoblox VM maintenance range through three defined attributes: extended coverage timing for years 4+, a 1-year duration, and the Level 3+ maintenance tier. It does not represent a new VM deployment, a capacity expansion, or a physical appliance. Use it where the requirement is to continue the applicable maintenance tier for the existing covered VM-NS1MSGRID service period.