Easy switching between ISAPI and FastCGI modes with predefined option values, which can be fine tuned in webserver.dat if necessary.
PHP processing eAccelerator was replaced by XCache. It's optimizing the PHP compiled bytecode and caches it to shared memory, to reduce overhead and improve performance of repeatedly run scripts. Results in 9% speed increase and the same stability.
DIGEST MD5 authentication can be used, digest is created upon request by HTTPClass.
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Application Specific FastCGI Timeout
Through webserver.dat it allows to override FastCGI timeout for specific extensions (filters) used for ActiveSync URL (default 25 minutes, up to 30 minutes). Global timeout still remains at 2 minutes.
CGI support for CERT_ and CERT_SERVER_ variables
Support for new variables including SUBJECT, ISSUER and FLAGS has been added. If used will require and verify peer certificate authentication can be based only on the client certificate using CERT_SUBJECT.
Directory Content Listing Scripts
New, safer scripts created for directory content listing.
Support for Port in Virtual Host Name
Administrator can specify port for a virtual host, server checks the local port if virtual host name port present.
WCS HTTP Binding Service
Multiple wait connections handling added, improved thread safety, last connection receives the result.
WCS Support for JSON
Introduced for IM client in WebClient, other improvements done so that WCS is now ultra stable.
HTTPInfo Structure Cookies Auto Set
Cookies element is automatically set for the site in the HTTPInfo information block.
RegEx Rewrite R Flag
Support for [R=<httpcode>] added.
RegEx Rewrite Error Responses
Support for URL and File RegEx search and rewrite, File changes the error Content-Type properly, to redirect a non existing path to a real do: 404;/webmail/client/skins/myskin/(.*) URL /webmail/client/skins/default/$1.