We migrated a lot of content from a Wordpress based site to TKB half a year ago (and we still have a few on-going projects for different language versions). Migration process went somewhat smooth, Khoros did 4 migration tests for us before we migrated the whole content for real. After each migration test we could check our content (approx. 900 articles) and give feedback for them. Our biggest challenge was that our previous site used a lot of custom Javascript based solution for special HTML content, and it caused problems many times. Now that we migrated the content, it looks OK, but whenever we touch them, it is really easy to destroy and make these articles unusable. I think if you used something basic and default, there will be no issue, but custom solutions can cause headache when it comes to migration.
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