Apple has continued to send out invitations to users of its iCloud backup and sync service to try the beta of iWork for iCloud, the online word processing, spreadsheet and presentation-making apps slated to release to everyone later in the year.Related StoriesApple's 'walled garden' cracked by hacked chargerMac Gems: Free up your Mac's RAM with Memory CleanApple to shrink some iCloud accounts by 20GB
