Q. TS wrote: We have over 10k users in this department. When we migrate to IDM, must we migrate EVERY person at the same time, or can we do it in smaller chunks (i.e. region by region)?
A. You can definitely migrate your user information in smaller chunks. And bear in mind that migration may not be needed for all components. As mentioned in the upgrade and migration doc http://www.novell.com/documentation/idm401/idm_upgrade/data/bpgkkrw.html, the IDM engine and other components can be upgraded.
Only the Roles Based Provisioning Module (RBPM) needs to be migrated. In the case of RBPM migration, depending on the partitions in the tree and the number of servers, each server can be migrated one at a time. Check the documentation for more details: at http://www.novell.com/documentation/idm401/idm_upgrade/data/bu7mrjt.html
Disclaimer: As with everything else at NetIQ Cool Solutions, this content is definitely not supported by NetIQ, so Customer Support will not be able to help you if it has any adverse effect on your environment. It just worked for at least one person, and perhaps it will be useful for you too. Be sure to test in a non-production environment.