The following is the Microsoft Pattern which i attended.

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1)  Written test of one hour
  
Aptitude questions and in  same section some puzzles  asked like 
make 4 lines in 3 by 3. 

dots by covering all the dots. something of these sort will be asked. 

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Next  c-language . in this  asked tricky pointers questions and some 
questions based on short circuit   evaluation etc. 
     individual cutoff in both the section.
       30% will be selected in this round. 
 
2) Group Discussion
      This is second elimination round. roughly around 2-3 ppl will be 
selected among grp of 10. 
       Good communication skills are important.
       topic  given is: Impacts of Internet on Society.
3)  Personal Interview.
     Here mainly they will ask about project.
 
Generaly microsoft  will be taking about 30 students for internship during 
a year. They will be conducting recruitment process for 4 times a year . 

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Goodluck try your luck in Microsoft.