There was an issue reported on the iCloud support forums recently from multiple users who say they are unable to access any messages received prior to July 30th. Users claimed that messages synced with iCloud disappeared from their devices. Apple has promised to return these messages, saying the following on its iCloud Support page:
“A small number of users may currently be unable to access older email messages. Sending and receiving new messages is unaffected. Access to older messages affected by this issue will be restored ASAP.”
While users await the return of their older messages, some claim to have found interim solutions, such as restoring their Mail client from a Time Machine backup. However, other users are claiming that iCloud will immediately delete the emails once a sync has occurred.
Have you experienced this issue with your iDevice?