If you have an earlier version of WebSphere® MQ installed on a Windows NT® machine, you will need to migrate the operating system to Windows® 2000, Windows XP, or Windows 2003. Be aware that your current access control lists (ACLs) for your domain resources might become invalid.
On Windows NT, WebSphere MQ user account details are stored as security identifiers (SIDs) in your ACLs. When you migrate to a new Windows platform these SIDs are lost, invalidating the ACLs. This causes WebSphere MQ commands to fail, and you lose registry permissions and the WebSphere MQ Administration (mqm) security group.
Consult your operating system documentation on migration from Windows NT for details about how to remap the ACLs on your domain resources. You do not need to reinstall WebSphere MQ if you choose this option.
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