Rob Horwitz analyzes and writes about Microsoft licensing programs and product licensing rules. He also trains organizations on best Microsoft licensing practices.
Before co-founding Directions on Microsoft in 1992, Rob spent eight years at Microsoft in a variety of software development and technical marketing roles. He was a software developer on the first version of Macintosh Word and marketed Microsoft operating system- and server-based products while in the developer relations, networking product marketing, international, and OEM marketing groups.
Rob holds a B.S. in computer science from the Massachusetts Institute of Technology and an M.B.A. from Wharton.
Latest Content by Rob Horwitz
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April 23, 2026 · by Rob Horwitz
Teams-related Product Packaging
Maps Teams-related license types (most Teams-branded) to the AI, collaboration, and management/security capabilities, as well as client-side device support, they...
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April 17, 2026 · by Rob Horwitz
CAL Suite Contents
Outlines the components currently in the Core CAL Suite and Enterprise CAL Suite.
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April 17, 2026 · by Rob Horwitz
CALs Included with Online Services Suites
Enumerates the CAL (client access license) and Client ML (Management License) subscriptions included with Microsoft 365, Office 365, and Enterprise...
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Updated: April 17, 2026 · by Rob Horwitz
External User Qualification Requirements
Explains the criteria a contractor or agent working on behalf of an organization licensing Microsoft software must meet for the...
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April 17, 2026 · by Rob Horwitz
Enterprise Agreement Contract Stack
The interconnecting legal documents that form what is commonly thought of as an “Enterprise Agreement contract.”
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April 17, 2026 · by Rob Horwitz
Microsoft 365 Apps for enterprise Packaging
Compares Microsoft 365 Apps for enterprise features provided on Windows/Mac, mobile, and browser clients, based on the level of user’s...
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April 17, 2026 · by Rob Horwitz
Office and Windows Supported Combinations
Lists supported combinations of Windows OSs and Office suites (Microsoft 365 Apps for enterprise and Office Professional Plus / Standard),...
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April 16, 2026 · by Rob Horwitz
Microsoft 365 Enterprise Suite Packaging
Compares components/features bundled within Microsoft 365 F3, E3, and E5 suites
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April 16, 2026 · by Rob Horwitz
Microsoft 365 Extensions
Enumerates the many dozen discrete licenses that extend or augment the capabilities included with Microsoft 365 suites.
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April 16, 2026 · by Rob Horwitz
Office 365 Enterprise suites packaging
Compares the contents of Office 365 F3, E1, E3, and E5 suites.