Microsoft let us know that it intends to release Internet Explorer 5.2.3 for Mac OS X later today. Version 5.2.3 offers “security and performance enhancements, as well as improved browser compatibility for enterprise users who work on a network with secure authentication or with proxy servers,” the company noted. In addition, Internet Explorer 5.1.7 for Mac OS 8/9 will be released later this month with similar improvements. The update will be available for free download from Microsoft’s site when it is released. Update: Version 5.2.3 has been released and can be downloaded here.