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Modernizing Legacy Applications to Microsoft Azure
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When it comes to legacy workload deployment options, they were pretty specific to the platform you were using at the time. This is especially true for mainframes where there was a well-defined and accepted way to deploy applications. There was not a lot of variety in transaction managers, filesystems, queueing architectures, and databases. You used what was on the machine platform, and whichever tool you decided to use, it usually did a very good job at whatever it was supposed to do. A good example of this is Customer Information Control System (CICS) on IBM mainframes. If you were writing online applications on a mainframe, this is what you used to communicate with the database (typically Db2) and the user (typically a 3270 terminal). IBM midrange systems were very similar. Legacy Unix systems did allow more variability but, for the most part, had a specific set of vendor solutions that did a specific job for your application.
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