You've probably used Knowledge Base (KB) to help troubleshoot an issue or answer a question. Check out this list of the KB articles that are most viewed for
Microsoft Dynamics AX

 2503850               
Description of hotfix rollup 7 for Microsoft Dynamics AX 2009 Service Pack 1                                       
                                                             

2405516               
Description of hotfix rollup 6 for Microsoft Dynamics AX 2009 Service Pack 1                                       
                                                               

982812                 
Hotfix rollup 5 (982812) is available for Microsoft Dynamics AX 2009 Service Pack 1                           
                                                                               

957312                 
How to install Microsoft Dynamics AX 2009 with SQL Server 2008 and the .NET Framework 3.5 Service Pack 1                                                                                                   

893082                 
How to install a Microsoft Dynamics AX hotfix                                                                                                    

By the way, you’ll find it’s easier than ever to locate KB articles for Microsoft
Dynamics AX. You can continue to use PartnerSource and CustomerSource to find
KB articles. In addition, you can now search, find, and view those same articles using a search engine like Bing. 

Here are a few search tips for you.  Use the words “Microsoft Dynamics AX"
in your search to help narrow down articles to only the AX product and no
others.  Also, if you want to limit your search to Knowledge Base
articles, use the abbreviate “kb” in your search.  For example, if I want
to find information about how to import customers and vendors in Microsoft
Dynamics NAV, in Bing I’d search on “Microsoft Dynamics AX kb import”. When I
do that, one of the first things that pops up is KB article #960729 titled “How
to import customers and vendors in Microsoft Dynamics AX 2009”. 

Try it and see what you think!