The minimum system requirements are:
Pentium II 450 (MHz) or higher.
64 MB RAM minimum (128 MB recommended).
Windows 98 SE (Second Edition), ME, 2000, XP, or NT with Service Pack 6.
Internet access recommended.
Microsoft Office 2000, XP or 2003 (for MS Office Plug-ins).
Works with MAC OS X using Microsoft Virtual PC (only with the purchased version)
ESI Professional: 76 MB of free hard disk space.
ESI Standard: 74 MB of free hard disk space.