About 20 percent to 30 percent of your applications are not economically viable to move to the public cloud. These are applications with no platform analogs in the cloud, such as traditional mainframe applications. Or, even if there are platform replicants, they are not of enough business value to invest in the migration.

Many hope that these applications will just go away upon moving to the cloud, but most hold significant business value and can’t yet be retired. If you’re looking to get out of the data center business, what are you to do with these outliers?

[ PaaS, CaaS, or FaaS? How to choose ]

There are a few options to consider:

First, move to an MSP (managed services provider) that can host the legacy platforms to run your legacy applications. The idea is to pick an MSP that’s able to accommodate your use of cloud-based resources as well as your legacy applications, and one that can do so from a single, well-managed set of services.

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