Last week, we discussed the fact that data center consolidation is a top priority for most IT managers. Application consolidation isn\u2019t far behind.Most companies we work with have more applications than they want - typically several hundred to several thousand. Many are legacy apps - programs more than 10 years old and either home-built or purchased from a vendor that is no longer in business or supporting the product.I recently spoke to one IT manager who\u2019s managing more than 5,000 applications (yes, that\u2019s three zeros), and another who\u2019s trying to whittle 600 applications to 60.Why consolidate? Decreasing the number of vendors you deal with, and the number of licenses or home-built apps you manage, can reduce complexity. And replacing legacy apps could significantly lower your costs downstream. One company I\u2019ve worked with still runs dozens of industry-specific programs that are more than 20 years old. Though the applications continue to work well, it\u2019s getting more difficult to find technicians with the skills (and desire) to support them.There are several ways to consolidate applications.First, use a suite of products from a single vendor, such as Oracle or SAP. Relying on one vendor for all your needs in a particular area (say, customer relationship management) can ensure that your business processes are well aligned across applications. And using multiple modules from a single vendor can significantly reduce - though rarely eliminate - integration headaches.But there are downsides. Replacing homegrown apps with a suite usually means sacrificing some functionality; suites don\u2019t offer the depth of features that many best-of-breed vendors do. Smaller enterprises may have greater clout with smaller, best-of-breed vendors than with the \u201cbig guys\u201d like Oracle and SAP. And consolidation can equal lock-in; once you settle on a handful of vendors and rip out everything else, it can be hard to go back.Second, migrate to apps based on Web services, which can help minimize redundant functionality. Given that Web services frameworks permit the creation of homegrown applications that are standardized, easily supported, and spot-on when it comes to delivering the specific functionality required by lines of business, you may want to consider consolidating several archaic apps into a Web-services-based solution - and thereby make your life easier down the line.Third, review and streamline your business processes, to allow you to eliminate certain applications altogether. If you\u2019ve bought enterprise software from any of the large vendors in the past several years, you may very well have redundant technology; the new tools can probably do a lot of what your older software is doing. Furthermore, if you can eliminate certain business processes altogether, you can eliminate the apps that support them, too.Want to hear more about data centers? Catch the next Network World New Data Center Tech Tour on April 27 in Denver or April 29 in San Diego (see https:\/\/www.nwfusion.com\/events\/itseminars.html to register). Hope to see you there.