ll times and all places.</span><span style="font-size: 12pt; color: blue; font-family: 'Times New Roman','serif'"><o:p></o:p></span><span style="font-size: 12pt; color: blue; font-family: 'Times New Roman','serif'"> <o:p></o:p></span><span style="font-size: 10pt; color: blue; font-family: 'Arial','sans-serif'">Many challenges in this field differ from normal web search.  A first one is the wealth of different data sources that have to be searched, e.g., intranets, sales databases, product documentations, 