I had a requirement to consume zip files and unzip them into the target folder using BizTalk. The most strait forward way to accomplish this is to develop a custom send adapter that would unzip the files to the target directory. I used the ICSharpCode.SharpZip for unzipping the files. I will write more on how to develop custom adapters, but at the moment I am making this code available to you in the download samples section. If you need any help or have questions do not hesitate to contact me at Moustafa@MoustafaRefaat.com