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Not so trivial if you use GitHub issues, PRs, etc.

Actually, quite trivial to import:

As long as MS won't do something shitty, like closing half of Github's APIs.

Even a gradual “manual” move would be pretty easy for most orgs. Most are probably only using issues and PRs.

Close/merge all your PRs, put in an edict that says “no new issues” in GitHub, eventually all existing tickets will be close or go stale.

Most organizations could probably use the house cleaning anyway.

The Firefox ticket linked above says they're keeping their current issue tracking system.