The Apple Configurator augmented VPP by letting IT admins unlink apps from employee iTunes accounts and link them to the managed device.

FORBES: Four Ways Apple Is Evolving Mobile App Management

The VPP platform provides a suite of capacity and energy reserves products for utilities based on sophisticated load management for homes and small businesses.

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By contrast, the VPP is a demand response platform that manages load on the demand side to create capacity and other products for electric utilities.

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Introduced in 2011, the VPP enabled companies can buy a large set of App Store redemption codes that it can distribute to employees, like gift cards, to buy apps.

FORBES: Four Ways Apple Is Evolving Mobile App Management

Still VPP is not a true volume software license.

FORBES: Four Ways Apple Is Evolving Mobile App Management