+Rewritten IMAP functions and added extra data caching code. Internal sorting
+functions should be faster than code used in SquirrelMail 1.5.0 and older
+versions. Data caching should reduce number of IMAP calls in folder management
+and mailbox status functions.
+
+Own gettext implementation replaced with PHP Gettext classes. Update adds
+ngettext and dgettext support.
+
+Templates, css and error handler.
+
+SquirrelMail started using internal cookie functions in order to have more
+controls over cookie format. Cookies set with sqsetcookie() function use
+extra parameter that secures cookie information in browsers that follow
+MSDN cookie specifications.
+
+SquirrelMail IMAP and SMTP libraries updated to allow use of STARTTLS extension.
+Code is experimental and requires PHP 5.1.0 or newer with
+stream_socket_enable_crypto() function support.