While Microsoft has already launched Office 2007, the complete revision of how a traditional Office Suite would look like, I am hesitating to make that change. Microsoft Outlook 2003, one of the most useful applications in Microsoft Office, stores its email in a file with .pst extension. There is a special feature within Outlook 2003 (and also previous versions of Outlook) that allows user to select the compression or encryption level.

Basically, there are three level of encryption:

• none
• compressible
• high encryption

(find out more about the encryption or compression feature in Outlook 2003)

Dot-product, or rather vector dot-product, does not have a familiar phrase to use in Microsoft Excel. For instance, if you want to perform the following operation,

=(A1*B1)+(A2*B2)+(A3*B3)+...+(AK*BK)

which exactly resembles that of a vector dot-product; that is, A*B where A = [A₁ A₂ ... A_K] and B = [B₁ B₂ ... A_K]^T.

(Quick way to obtain the dot-product in Excel...)