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Some software vendors, particularly that one in Redmond, have specific licensing fees for when their software is used (or sold) in a hosted environment.
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If they want support services or advanced features that help the software fit into the modern IT environment, they must purchase a subscription.
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Other software works on ways to transform applications while minimizing risks like compliance or dependence on the software by a remote department, then put it in a cloud environment, untied to any particular server if that is appropriate. (This stage is where the Microsoft part comes in.) Afterward, there is a security assessment, checking software for security attacks in real time.
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