Apple is warning users of old versions of iTunes that it plans to stop allowing those versions to connect to its music store.

iTunes Store customers who are using versions that pre date iTunes 4.6 receive a message from Apple that says: "You are using a version of iTunes that will soon no longer be supported. Upgrade today to take advantage of the latest application features and music store enhancements."

Any changes to the store are likely to be announced next week. Apple plans to hold a music-related event. Members of the band U2 will join Apple.

Other announcements may include the extension of the facility to other European countries – something Apple had said it would do in October.

It is also likely that changes will enable Apple to protect tracks bought at the iTunes Music Store from workarounds and third party software that allows the DRM on protected music to be broken.