The information in this article explains how to use an operating environment called sandbox mode in Microsoft Office Access 2007. In sandbox mode, Access blocks all expressions that it does not consider safe. In this case, an unsafe expression uses functions or properties that could be exploited by malicious users to gain access to drives, files, or other resources for which they do not have authorization. For example, functions such as Kill and Shell could be used to damage data and files on a computer, so they are not considered safe.