An n-tier configured Internet Message Access Protocol (IMAP) compliant mail server. A collaborative messaging application can include an IMAP compliant mail server configured for operation within an n-tier enterprise environment provided by an application server. The collaborative messaging application also can include a markup language driven interface to the IMAP compliant mail server disposed within a Web container in the application server. A data store can be configured to store messages process by the IMAP compliant mail server. Finally, a directory can be configured to provide configuration and addressing data to the IMAP compliant mail server. Importantly, the IMAP compliant mail server can include a set of platform independent classes programmed for execution in a virtual machine and specifically operable in the n-tier enterprise environment. In particular, the virtual machine can be a Java virtual machine and the n-tier enterprise environment can include J2EE.