In addition to other people's applications, they created many Linux extensions to fill voids where no other commercial company was. Caldera Systems began working on a Linux equivalent of replacing the Microsoft Exchange Server and Microsoft Outlook that would eventually become Volution Messaging Server, which offered calendaring/scheduling options with shared busy/free information, SSL support for e-mail and easy configuration. Additionally, Caldera Deutschland created the first fully graphical installer for Linux, called Lizard, starting in November 1998. They invented browser-based Unix system administration, created the webmin project, and employed its developer Jamie Cameron between 1999 and 2001.