We have a client that is migrating all of their users from multiple forests to a new forest. When this migration is complete and they have new accounts under the new forest, they will no longer be able to finish the active Forms processes they had assigned to their previous account nor will they be able to see the data from the historical process they completed in the past with their old account. I've seen a lot of posts with procedures regarding migrating from LF Users to LFDS users, but is there a way to migrate from one AD Account to another to maintain their relationship to their historical data.
*Note: Their Windows SID is not going to change.
We were told by LF that if the windows SID doesn't change we should be fine and any process step assigned to them would still be accessible by the new account because the SID stays the same. However, we tested one and the SID in Forms IS changing. So the user was severed from their current tasks.
This customer has upwards of 800+ users to migrate so manually updating SIDs or reassigning tasks is not efficient.
Is there anything that can be done to prepare for this migration and automate the cutover?