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Since the Issue Tracker is a vital part of OOo and there are thousandsof links to the OOo Issue Tracker around, now automatically mapped toBugzilla links, I'd choose a tool that allows a painless import from thecurrent Bugzilla: if the current Bugzilla hasn't been customized too much, then Bugzilla seems the most convenient choice.
FWIW, I understand JIRA has a tool to import bugzilla databases. Pedro.
