SAP BO, SAS and Siebel are key players in BI. MS is a baby with BI.

MS is not a baby with BI - statements like this are historically and factually incorrect and slanted.

One of the many key components of Business Intelligence is the MDX language. Microsoft (and some contractors working for MS at the time) created the MDX language the late 1990. Several of the companies/products you mentioned above (along with other OLAP vendors) later adopted the MDX language.

Microsoft also published an OLAP specifification around the same time, which other vendors also adopted.

These two facts alone vitiate your comments.

What is more accurate is that many of the MS tools did not receive serious (and deserved) attention until SQL Server 2005. What is more accurate is that prior to SQL 2005, MS wasn't viewed as a strong OLAP vendor - but the truth is that every OLAP offering from every vendor had serious issues.

Microsoft is now considered a key player on the BI "magic quadrant", with integration into SharePoint and Office. Take a look at the Gartner report for BI vendors, published earlier this year.

There are people in the world who talk about BI who actively work in it - and there are also toilers, dabblers, cranks, and those who are innocently mistaken.