Apple has sent email to developers of iOS and Mac Developer program to inform them that their iCloud libraries will be deleted on Monday, September 26th at 9AM PDT.

Apple has stated that it is deleting iCloud libraries to improve the overall quality and reliability” of the iTunes match service. 

Apple has sent the following email to developers:

To continue to improve the overall quality and reliability of iTunes Match, it has become necessary to delete all current iCloud libraries.

All iCloud libraries will be deleted on Monday, September 26th at 9AM PDT. To prepare, please turn off iTunes Match on all of your computers and iOS devices. On your computer, choose Store > Turn off iTunes Match. On your iOS device, tap Settings > Music, then turn off iTunes Match.

The songs on your computer should not be affected. As always, please backup regularly and do not delete the music you add to iCloud from your computer.

Apple seems to be preparing for the iOS 5 and iCloud launch as it had also wiped all the iCloud backup data on Thursday, September 22nd.

Reports indicate that Apple will unveil iPhone 5 at a media even on October 4th, followed by the release on October 14th. It also looks like Apple is gearing up for iOS 5 launch on October 10th, in which case, Apple should launch iOS 5 Golden Master anytime this week.

[via MacRumors]