They are the same tool, the difference is the licencing. Cognos TM1 Express is limited to 100 users and I believe a single instance on one box. The connections to BI are also limited to Reporting and Query Managers (Analytics is excluded). You can plug into EV.
Cognos TM1 Analytics is the industrial version with unlimited users, unlimited instances on one box, and no restrictions on connectivity to Cognos 8 BI tools.
Please do not send technical questions via private message or email. Post them in the forum where you'll probably get a faster reply, and everyone can benefit from the answers.TM1 New Zealand Kapiti Plumber