We are about to install Unity 4, with Exch 5.5 (unified) and were wondering about the possible risks/changes to the Exchange 5.5 environment. Am I correct in saying that Unity will store information in 4 custom attributes (hidden) within the Exchange directory? What other changes are made? This is part of a risk assessment, and a suitable backout plan is required.
What other areas should we be concerned about in the Exchange environment? Are there any other major problems we could encounter?