CRM 2011 Importing Data Limit/ Maximum Importing Data

Data Import Wizard Will not upload files past 32mb

Let say if your file is around 200mb in size. The web.config file has the maximum file size in it, so you can edit it to allow for bigger sizes or break the file up into smaller chunks.

Recommended
I prefer to temporarily raise the limits. Note. the data you are importing will takes times.

Default file Location
C:\Program Files\Microsoft Dynamics CRM Data Migration Manager\DMClient\res\web

file web.config

Default data in the file

<?xml version="1.0" encoding="utf-8" ?>
<configuration>
<system.web>
<httpRuntime executionTimeout="1200" maxRequestLength="32768"/>
<compilation defaultLanguage="C#" debug="false">
<assemblies>
<add assembly="Microsoft.Crm, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35"/>
<add assembly="Microsoft.Crm.Sdk, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35"/>
<add assembly="Microsoft.Crm.SdkTypeProxy, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35"/>
<add assembly="Microsoft.Crm.Platform.Sdk, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35"/>
</assemblies>
</compilation>
<authentication mode="Windows" />
<identity impersonate="true" />

</system.web>
</configuration>


I choose to modify maxRequestLength="32768" to be maxRequestLength="300000"