Unfortunately we are not migrating from one version of SP to a new version of SP. We are removing SP all together, but we need to maintain the current user database and the associated schemas that was stored in SP. In the end, we are developing our own app
which will use the old SP user database (ADAM / ADLDS) to authenticate to
From research thus far, I think we can take a dump of the user database (old domain) and import it but the passwords do not get carried accross. Was trying to make a seemless migration from SP to new NON SP environment but so far, no luck