Last Friday I migrated our in-house instance to 3.0. Everything went smoothly, but I have noticed that the "resolved date" on any issues resolved before the migration got set to the time of the migration. This is unfortunate, because we are doing our project planning based on this data. This seems like a deficiency in the migration tool.
I still have the pre-migration data, but I do not see an obvious way in the REST APIs to copy just the resolve dates over. Has anybody else out there solved this problem?