Map caches that you created in ArcGIS Server 10.0 and previous versions can be used in later versions.
To migrate a map cache please follow the steps from the ESRI Help (subchapter Migrating map and globe caches):
Note: To view the status of migrated caches please use the tool in ArcGIS:
Toolbox Tool - Server Tools - Caching - 'Manage Map Server Cache Status'.
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