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I took a look at the new SharePoint 2010 web.config file, and here are the changes I have found so far:

New sections include:

• 3 new SharePoint sections:

• WorkflowServices - new SharePoint based section
  
• OutputCacheProfiles - basic asp.net section
  
• ObjectCache - basic asp.net section

• New Workflow section

• authorizedRuleTypes

New sections groups:

• "system.web.extensions" - this drives the AJAX funtionality
• "microsoft.sharepoint.client" - this drives the WCF client proxies for service applications
• "ReportingServices" - for Reporting service integration
  
• "Bpm" - Performance Point section
  

 Safe controls added:

• Too many to list here, but all are newer 14.0.0.0 assemblies for SharePoint 14

 A flurry of merge actions (for understanding a merge action check this other blog entry)

 For IIS 6.0 system.web section:

• No HttpHandlers are configured.
• CustomErrors is Off
• No HttpModules are configued

Several new assemblies are complied:

• System.Web.Extensions
• Microsoft.Web.CommandUI
• Microsoft.SharePoint.Search
• Microsoft.Office.Access.Server.UI
• Microsoft.SharePoint.Publishing

 New ExpressionBuilder added:

• SatelliteResources

 New Build Provider added:

• ".json"  

Controls section added by default now:

• "asp" of System.Web.UI

 Default siteMap provider is now called "CurrentNavigation" (use to be CurrentNavSiteMapProvider).  Includes new providers:

• ExtendedSearchXmlContentMapProvider
• GlobalNavigation
• CurrentNavigation
• MySiteSubNavProvider

Removed the:

• UsagePagesSiteMapProvider

New WebPart Transformers:

• TransformableBIDataProviderToFilterValuesTransformer
• TransformableBIDataProviderToWebPartParametersTransformer
• TransformableBIDataProviderTransformer
• TransformableFilterValuesToEntityInstancesTransformer

New Mobile Controls Section:

• SPMobileHtmlDeviceAdapters
• SPMobileChtmlDeviceAdapters
• SPMobileXhtmlDeviceAdapters

SessionState is removed from the IIS 6.0 system.web section

FULL IIS 7.0 "system.webServer" section has been added

• Modules removed
• OutputCache
• FormsAuthenciation
• UrlAuthorization
• WindowsAuthentication
• RoleManager
• Session 
• Handlers removed
• SPHttpHandler!!! - everything is done via the modules!
  

System.Workflow.ComponentModel.WorkflowCompiler

• In SP2010, you cannot use a "While", "ConditionedActivityGroup" or a "Replicator" activity in SharePoint web applications.  They have set "Authorized" to "False"!!! - WHY?
• Rather than all types in mscorlib, they have explicitly set it so you can only use
• Guid
• DateTime
• Boolean
• Double
• String
• Hashtable
• ArrayList
• DebuggableAttribute
• ComplationRelaxationAttribute
• RuntimeCompatibilityAttribute
• Int32
• TimeSpan
• Generic Collections
• New authorized types
• SPItemKey
• SPWorkflowUserContext
• New assemblies
• Microsoft.Office.Access.Server.Application
• Microsoft.Office.Workflow.Actions
  

Four new location settings with a timeout of 3600ms:

• _layouts/UploadEx.aspx
• _layouts/ctdmsettings.aspx
  
• _layouts/policyconfig.aspx
• _layouts/metanavsettings.asxp

• _vti_bin/EwaInternalWebService.json
• _vti_bin/DynamicGridContent.json

New location settings random:

• _layouts/pptInsertPicture.aspx
• _vti_bin/powerpointBroadcastHost.asmx
• _vti_bin/powerpointBroadcastHost_1_0.asmx - what the heck is this for I wonder?
  
• _vti_bin/present.asmx
  

Two new appSettings keys - why the hell these are here and not a config section is beyond me!

• PptServer_Pipe
• PptServer_BroadcastManager