Legacy applications are often the bane of an IT manager's existence. It's not simply because they're old and are no longer in alignment with the enterprise's requirements--if a particular legacy application was easy to modify, then the IT department would simply update the application to bring it in line with the organization's needs. Sure, that takes work, but if the application was designed for change, then the effort required is nothing extraordinary. Rather, the real problem is that many legacy systems are resistant to change, because they weren't developed with flexibility and scalability in mind. This makes maintenance and enhancement very difficult.

The solution is to migrate to newer, more cost effective, more flexible and ultimately more scalable systems. But, how do you go about effecting this migration? The philosophy behind migrating to scalable environments involves three critical concepts:

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