From Microsoft.com:
http://web.archive.org/web/20011004173014/http://www.microsoft.com/unix/ie/downloads/recommended/ie5/default.asp
http://web.archive.org/web/20011202100008/http://www.microsoft.com/unix/ie/evaluation/sysreqs/default.asp

Download the most up-to-date version of Internet Explorer available for Solaris and HP-UX versions of UNIX.

Note: All UNIX versions of Internet Explorer currently available on this site give you 128-bit encryption, the highest level of protection possible whenever you use credit cards or make other financial or confidential transactions over the Internet. Internet Explorer with 128-bit encryption is eligible for export from the U.S. to all customers worldwide, except to U.S. embargoed destinations. Information on exporting Microsoft technologies is available on the Microsoft Exporting Web site.
How to download and install

    Click one of the download links on the right to begin downloading the program.
    Save the program in a writable directory e.g., "/tmp".
    Make the program executable. For example, in Internet Explorer SP1 for Solaris: 'chmod +x ie5setup.sunos5'.
    Run the setup program. For example, in Internet Explorer SP1 for Solaris: './ie5setup.sunos5.
    When Setup prompts you for an installation directory, accept the default directory or type in a new directory path. (Note that installing to the default directory, /usr/local/microsoft, may require root access.)

System Requirements

Before you download Internet Explorer 5 SP1, make sure that your computer meets or exceeds the system requirements detailed in the following pages:

    UNIX (Solaris and HP-UX) system requirements

System Requirements
Posted: August 27, 2001 	
	

To run the released version of Internet Explorer 5 Service Pack 1 (SP1) for Solaris, your system must meet the following minimum requirements:
Minimum Requirements
Computer/Processor 	A Sparcstation 2 or greater
Operating System 	English Solaris 2.6 and above (see README for patch information)
Memory 	64 megabytes (MB) of RAM (96 MB recommended)
Hard Disk 	110 MB of hard disk space to perform the installation

To run Internet Explorer 5 SP 1 for HP-UX, your system must meet the following minimum requirements:
Minimum Requirements
Computer/Processor 	HP 9000 Enterprise Server, HP 9000 Workstation, or HP Visualize Workstation
Operating System 	English HP-UX Operating System version 11.0 or later (see README for patch information)
Memory 	64 MB of RAM (96 MB recommended)
Hard Disk 	120 MB of hard disk space to perform the installation

To run the released version of Internet Explorer 5 for Solaris, your system must meet the following minimum requirements:
Minimum Requirements
Computer/Processor 	A Sparcstation 2 or greater
Operating System 	English Solaris 2.5 and above (see README for patch information)
Memory 	32 MB of RAM (64 MB recommended)
Hard Disk 	68 MB of hard disk space to perform the installation

To run Internet Explorer 5 for HP-UX, your system must meet the following minimum requirements:
Minimum Requirements
Computer/Processor 	HP 9000 Enterprise Server, HP 9000 Workstation or HP Visualize Workstation
Operating System 	English HP-UX Operating System version 10.20 or later (see README for patch information)
Memory 	64 MB of RAM (96 MB recommended)
Hard Disk 	87 MB of hard disk space to perform the installation