title: **WHY** would I use prefiltering in CRM 2011 report
body: <p>I was told about pre-filtering when writing reports in CRM 2011 and it sounded like something I should add to my knowledge base so I Googled it and found:</p>
  
  <p><a href="http://blogs.msdn.com/b/crm/archive/2009/03/06/microsoft-dynamics-crm-pre-filtering-tips.aspx" rel="nofollow">MSDN</a></p>
  
  <p><a href="http://www.powerobjects.com/blog/2012/05/31/microsoft-dynamics-crm-pre-filtering-for-crm-reporting/" rel="nofollow">PowerObjects</a></p>
  
  <p>and a whole bunch more. These gave me a good understanding of the how for both automatic and explicit. The one thing I missed though was why. I mean in general the articles said things like context specific or reduce the size of the query but I failed to translate that into the nuts and bolts business case example. For example one of the articles stated that it will greatly enhance your reports but what does that mean to the person in sales running the report. </p>
  
  <p>In other words I could easily add CRMAF_ to my queries but how it makes sales reports better I couldn't explain. Note I used better as that is the word the author of one article used so I took that to mean extra capability not better performance...?</p>
  
  <p>So a quick business case understanding would be great.</p>
  
  <p>Thank You</p>
  
  <p>JB</p>