4.21 даже под XP :)
Если использование MetaCube только планируется, то нужно помнить, что в планах IBM нет развития этого продукта, хотя сопровождать обещают столько, сколько нужно :)
Вот что я нашел в своих архивах (на сайте эта ссылка уже не работает, возможно документ переехал).
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IBM United States
Software Announcement 203-067
March 11, 2003

IBM Informix MetaCube ROLAP Option V4.21 Now Supports Windows XP and Later Releases of UNIX and Informix Databases

бла-бла-бла...

Key Prerequisites
Web Browsers for MetaCube Web Explorer:
Netscape: Version 4.7
Microsoft™ Internet Explorer: Version 6.0
If MetaCube Web Explorer is to be deployed, then a Web server (any) is required
Connectivity and Database Software:

Informix:
Supported
Informix Informix
Connect Databases
2.70 7.31
8.40
9.30

Red Brick(TM) Warehouse:
Supported
Client Supported
Connector Pak Red Brick WH

2.11 6.11

Microsoft Office 2000:
Excel 2000 (9.0)
Access 2000 (9.0)
Middle Tier Requirements for 3-Tier Configuration:
Microsoft Transaction Server, Version 2.0 or higher

Planned Availability Date
March 14, 2003

Description
Features of Informix MetaCube ROLAP Option V4.21 include:
...

Product information will be available on day of announcement through Offering Information (OITOOL) at:

http://www.ibm.com/common/ssi
and through the Passport Advantage Web site at:

http://www.ibm.com/software/passportadvantage
Publications
Informix™ MetaCube™ ROLAP Option V4.21

Specified Operating Environment
Hardware Requirements
For MetaCube Middle-Tier:

One of:
IBM or IBM-compatible Pentium, 200MHz or more
IBM RS/6000® or compatible
HP 9000 or compatible
Sun4 Sparc or compatible
DEC Alpha or compatible
Silicon Graphics IP-class or compatible
4MB RAM per MetaCube Agent thread
Software Requirements
Middle Tier:

Windows NT® 4.0 with SP3, or later
Windows® 2000 with SP1®, or later
Windows XP
Two-Tier Client:

Windows 98
Windows NT 4.0 with SP3, or later
Windows 2000 with SP1, or later
Windows XP
Three Tier Client:

Windows 98
Windows NT 4.0 with SP3, or later
Windows 2000 with SP1, or later
Windows XP

NT Agents:
Windows NT 4.0 with SP3, or later
Windows 2000 with SP1, or later
Windows XP

UNIX® Agents:
IBM AIX® 5.1
Sun Solaris 8
Hewlett Packard HP-UX 11i or HP-UX 11.0
Compaq Tru64 5.1
Silicon Graphics Irix 6.5
With the exception of Compaq Tru64 (64 bit only), all UNIX ports are both 32-bit and 64-bit compatible. Note that only Agents support a 64-bit platform.