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Per the release notes, we currently support TriGeo versions as far back as 5.0. We also provide an upgrade path as far back as 4.5.3. Here's a link to that section of the notes:
With the latest release, we've also added functionality that supports user-driven appliance migration, so getting from a hardware-based appliance to the new virtual appliance is easier than ever. Here's a KB article about that process:
Let us know if you'd like to be in touch with someone about upgrading to the latest version.