Release notes provide Operating Version details for each release of Vijeo Citect / CitectSCADA.  The article provides current version information available at the time of writing/updating.

Notes:

* this has not been officially tested but as long as the OS can run 32 bit applications there is no reason why it shouldn't work.

** v7.20 is currently in BETA. 

V7.20 has been tested for compatibility with Windows 7 using Microsoft's "Windows 7 Client Software Logo Toolkit", and has passed these tests. Approval to use the "Compatible with Windows 7" logo will be sought when the Final Release of the product has been created.

11. In version 5.50 the new XP Style templates and CitectSCADA Batch only work on Windows 2000 or later
12. The Process Analyst and Web Server only work on Windows 2000 or later
13. Modifications to the Windows default setup are required for CitectSCADA to run correctly. Please check the Knowledgebase for this.
14. Version 6.10 does not support Windows x64 operating systems.
15. You must use Internet Explorer version 6.0 or later if using the Process Analyst, Citect Web Client, or Citect Web Server.
16. If you intend to use the Web Client on Windows 2000 or Windows 2003 Server, you must first install the latest Windows Installer module on your machine. This is available via the Windows Update feature in Windows 2000 or Windows 2003 Server.