新版本最大的改变如下：

（1）、VS2010的支持，并且在VS2010之上可以直接打开V4.1、V4.0、V3.0三个版本的工程文件。

（2）、大端CPU支持，如SH2/A，参见：  http://cn.renesas.com/press/news/news20100726.html

（3）、SPI接口改变；

（4）、DPWS功能增强；

（5）、两个TCP/IP协议栈，EBSnet和lwIP；

（6）、支持OpenSSL；

下载：

1、.NET Micro Framework 4.1 SDK
http://www.microsoft.com/downloads/details.aspx?displaylang=en&FamilyID=cff5a7b7-c21c-4127-ac65-5516384da3a0
http://download.microsoft.com/download/0/9/5/0958CB08-E209-4DFD-A945-9DA0FE64B3A4/SDK.zip

2、.NET Micro Framework 4.1 Porting Kit
http://www.microsoft.com/downloads/details.aspx?displaylang=en&FamilyID=ccdd5eac-04b1-4ecb-bad9-3ac78fb0452b
http://download.microsoft.com/download/A/A/4/AA41297E-0889-4B10-A966-EF4F5E457670/PKProductNoLibs.zip

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Parts

There are 7 files to choose from in this release.  These are:

• The .NETMF SDK(.NET Micro Framework 4.1 SDK ) – to integrate with Visual Studio 2010 and create managed code applications that can run on devices supporting versions 4.1, 4.0, and 3.0 of the .NET Micro Framework.
• The .NETMF Porting Kit (.NET Micro Framework 4.1 Porting Kit ) – to enable developers to see all the code and to build their own versions if needed.  This is the package that allows developers to migrate the platform to new hardware.  New in this release is support for the Renesas SH2/A processors and HEW tools.
• The .NETMF Crypto Companion Libraries (.NET Micro Framework 4.1 Cryptographic Libraries ) – to give developer access to the XTEA, RSA, and other crypto functionality that has been part of the .NET Micro Framework since the beginning.
• The .NETMF TCP/IP and SDSL libraries build for four instruction sets:

• SH2/A (Tested on Renesas HEW 4.04 and 4.07)

• (.NET Micro Framework 4.1 TCP/IP and SSL Libraries for SH2/A Instruction Set )

• ARM ( Tested on ARM RVDS 3.1 and 4.0, Keil MDK 3.1 and 3.8, and GCC – CodeSourcery Distribution 4.2.1)

• (.NET Micro Framework 4.1 TCP/IP and SSL Libraries for ARM Instruction Set )

• Thumb ( Tested on ARM RVDS 3.1 and 4.0, Keil MDK 3.1 and 3.8, and GCC – CodeSourcery Distribution 4.2.1)

• (.NET Micro Framework 4.1 TCP/IP and SSL Libraries for Thumb Instruction Set )

• Thumb2 (Tested on ARM RVDS 3.1 and 4.0, Keil MDK 3.1 and 3.8, and GCC – CodeSourcery Distribution 4.2.1)

• (.NET Micro Framework 4.1 TCP/IP and SSL Libraries for Thumb2 Instruction Set ) 

Features and Changes

• Big Endian support – in previous versions, only Little Endian architectures were supported.  With Big Endian support we can now support a new set of processors
• New ports included – along with Big Endian support, we have support from our newest partner – Renesas Electronics (http://www.renesas.com/).  The processors and development boards that they have provided ports for are:
  • SH7216 RSK
  • SH27264 M3A HS64
  • SH7264 RSK
  • SH7619 EVB
• Support for Visual Studio 2010 – In this release,we are supporting multi-targeting which allows the 4.1 product working in VS2010 to support development of 4.0 and 3.0 projects as well.
• DPWS Enhancements – supporting full compatibility with Windows 7 and WCF 4.0 as well as support for Custom Bindings
• Two TCP/IP Stack options
  • EBSnet Stack – This is the excellent stack that has been in .NETMF for years now and continues to be the default stack.  This stack is supported by EBSnet and a number of extensions are also available through them (ebsnetinc.com).
  • lwIP – this is an Open Source stack that has been added to .NETMF in this version
• OpenSSL – this is an Open Source SSL stack to be used in conjunction with the lwIP Open Source stack
• Improved Application Diagnostics to assist in determining the size of the application
• Hashtable implementation
• SPI interface changes to ad flexibility and increase performance
• Port for SAM7S256 to support simple applications in very small footprint devices

详细内容请参见：http://blogs.msdn.com/b/netmfteam/archive/2010/07/19/netmf-versions-4-1-released-to-web.aspx