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Primary maintenance subscriptions include 12 months of technical support for one authorized caller and updates for one license. Primary maintenance is applicable to the first software license. For example, the first of every 10 ArcInfo licenses and/or any of its extensions that you acquire is considered a primary license (i.e., copies 1, 11, 21, 31, and so on).
Secondary maintenance subscriptions are typically applied to the additional nine software licenses. However, you may choose to have any combination of primary and secondary maintenance subscriptions as long as a minimum ratio of one primary to nine secondary licenses is maintained. For example, you may choose to have additional primary maintenance subscriptions to acquire additional primary maintenance benefits such as additional complimentary Esri User Conference registrations or added authorized callers.