The php53-mapi package contains the PHP 5.3 MAPI extension to provide access to Microsoft MAPI functions while using PHP. Although not all MAPI functions and interfaces are supported so far, most functions have a PHP counterpart in this extension. Using this PHP 5.3 MAPI extension, developers can create e.g. webbased e-mail and calendaring systems and interfaces with existing PHP projects, using the MAPI functions like a normal MAPI program.