Exploring New BI tools

Currently I'm exploring new BI tools after attending some demos from major vendors like SAP and Microsoft.
Microsoft has a free BI excel plug in that's simple to learn and use but very powerful, it's called power pivot. You can download it from www.powerpivot.com - check it out.
Microstrategy has similar architecture as Cognos so it's easy to learn it from Administration,Development and Design perspectives.

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