Email is one of the most used tools in enterprises for various purposes. However, the enterprise transformation programs are focusing today on social media tools rather than email. This paper discusses the properties of email in enterprises and whether further research is yet necessary on this tool. We provide a set of capabilities to compare between social media tools and email. As email is still affording some distinctive capabilities, we suggest improving this tool by applying a social bookmarking service to email messages. An experiment on the prototyped service highlights the perceived utility of email social tagging service for socializing employees' activities. The paper details, finally, future implications of this research.