Prepare Move Request Overrides target user data overwritelocalobject

Hi all, I'm migrating from Exchange 2010 email between two different forests.

The two forests are Windows Server 2008 R2.

The two forests have the same users, and these are in production.
In migration, I need to migrate all mail alias forest users and permissions origin shared calendars.

When I run Prepare-MoveRequest.ps1, and put-overwritelocalobject, I target the user overwrites user data.

I overwrite data as zip code, description ...

If I do not put overwritelocalobject, I migrated user aliases.

How I can migrate mailboxes and aliases calendars permissions without overwriting other user data target?

regards

---

Microsoft Certified IT Professional Server Administrator