I will be migrating from NetWare to OES/NSS (Cluster) and plan on creating one new domain and two new post offices. Our mailboxes size and quantity continue to increase, and we have spaces in our current GW domain and Post Office that seem to cause reporting issues with Redline.

Is there away to determine drive space requirements when splitting a PO into two PO's?
While using the GW user migration tools will it resolve case sensitivity issues?
Any other gotchas when migrating mailboxes?