How are you going to "move" exchange 5.5 to a new domain? Doesn't that basically boil down to a reinstall? In the past when I've tried such manuvers with 5.5 it usually ended up being a rebuild and using tools like exMerge to save my directory/messages. In cases like that you have to reinstall Unity (you can use export/import tools to save your Unity data, however).
Unity's health will be directly tied to the process of moving Exchange here. We link all our objects through the ObjectID (basically the distinguished name with some object type info tacked on). Anything that changes those values or breaks our links to any of the objects, accounts, directories etc.. in Ex5.5 will cause all kinds of pain in Unity.
Maybe you can recap how you plan to move Exchange for this operation? The official story is you'll have to reinstall Unity but I'm curious if you're going about this in a smarter way than I've done in the past. Perhaps you can do an export of your Unity data first as a safety measure and we can try a "hot swap" domain change. if it doesn't work you'll have to rebuild Unity and run the import (presuming your running 2.4.6 build 102 or later).
Jeff Lindborg
Unity Product Architect/Answer Monkey
Cisco Systems
lindborg@cisco.com
http://www.AnswerMonkey.net (new page for Unity support tools and scripts)
