SCOM: When i need Enterprise or Standard CAL

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https://www.microsoft.com/systemcenter/en/us/operations-manager/om-pricing-licensing.aspx

System Center Operations Manager 2007 R2 Licensing

Microsoft System Center Operations Manager 2007 R2 requires a Server License for each management server and a Management License (ML) for each managed Operating System Environment (OSE). The ML is offered in Enterprise and Standard Editions for management of server OSE, and in a Client Edition for management of clients and other OSEs not running server operating systems. An Enterprise Server ML is required for full application and server management, and a Standard Server ML can be used for operating system and basic workload management.