At my previous job one of my resonsibilities was to maintain several Exchange 2003 installations. One of the reasons I chose not to run Windows Vista on my laptop was because there was no Exchange System Manager (ESM) 2003 administrative tools that ran on Vista.
IMPORTANT: Installing Exchange System Manager on the same computer as Microsoft Office Outlook is not supported, because MAPI CDO cannot be installed
You can install Exchange System Manager for Exchange Server 2003 on a Windows Vista-based computer using the following requirements:
• Must be run on a computer in a domain that has Microsoft Exchange Server 2003 (SP2) installed.
• Must be installed on Windows Vista or Windows Vista Service Pack 1 (SP1).
• The following must be installed by a user who has Administrative rights. Windows Server 2003 Service Pack 1 Administration Tools Pack or Windows Server 2003 R2 Administration Tools Pack (x86). We recommend installing R2.
• Windows Server 2008 is not supported.