I have had trouble in the past when installing the Exchange System Manager (ESM) on my laptop so I can modify email information about a user in Active Directory Users and Computers (ADUC). I get conflicts with Outlook (some shared or overwritten DLLs I imagine) or in the case of Outlook 2007 Beta 2, outright consistent crashes. I found this article by Jim McBee on how to copy just the needed DLLs from an Exchange server to the workstation in question. The page isn't available on his site for some reason so access the cached version from Google here. I am also including below. Enjoy. This worked very well for me.
From an Exchange 2003 server, copy the following DLLs from the \program files\exchsrvr\bin folder in to a common folder (preferably in the path) such as \windows\system32 on the machine on which you want to manage Exchange attributes:
address.dll
escprint.dll
exchmem.dll
glblname.dll
maildsmx.dll
pttrace.dll
Once these are copied on to that machine, run REGSVR32.EXE c:\windows\system32\maildsmx.dll to register that DLL. When you re-open Active Directory Users and Computers, the Exchange extensions will show up!
tags: Exchange, ADUC, ESM, JimMcBee, ExchangeSystemManager