XCLN: Text Files Sent from Macintosh via IMC are Corrupted

When you create a text file on a Macintosh and attach it to a message that you send from the Microsoft Exchange Macintosh client over the Microsoft Exchange Internet Mail Connector (IMC), the file might contain extra characters at the beginning of the file. This will occur when the IMC is set up to use MIME to encode messages.

This problem is caused by the IMC converting these files to a MIME Content- Type of Text/AppleFile instead of Application/AppleFile.

Microsoft has confirmed this to be a problem in the Microsoft Exchange clients, version 4.0, listed at the beginning of this article. This problem was corrected in Microsoft Exchange Server 4.0 U.S. Service Pack 4. For information on obtaining the service pack, query on the following word in the Microsoft Knowledge Base (without the spaces):

The two major MIME types for Macintosh files are AppleSingle and AppleDouble.

When they are sent over the IMC, you should see the following:

• AppleSingle files are sent as Application/AppleFile
  
  
• AppleDouble files sent as Multipart/AppleDouble with two additional "sub-parts" of Application/AppleFile and Application/Octet-Stream (or another if the exact file type can be determined).