Our Technical Support Portal has changed as we have moved to a new platform. Please visit support.quark.com to access your support tickets or to log a new ticket with us. All our existing customers should look for an email from email@example.com for activation of their New Support Account. If you face any difficulty in accessing the new portal, please write to us at firstname.lastname@example.org
QuarkXPress 6 was for specific platform - either Mac OS or Windows. QuarkXPress 6 developed for one platform will not install on other. Therefore, you cannot use QuarkXPress 6 dual licensing if the platforms are different. Dual licensing on different platform is only possible for QuarkXPress 7 and above.
Yes, all versions of QuarkXPress 7 and above are system independent and can be used on different platforms.