Active Directory upgrade and Windchill

Dear Windchill Admins,

We are upgrading AD from 2003 to 2008 that is integrated with Windchill 9.1 M50. I would like to inquire if anyone done this and how have you accomplished that on high level. (any modifications to JDNI adapters, any manual task in Participant Administrator? etc…)

TIA,Artur