I tried to use the stock email app offline while on a plane today and it would let me read and reply. But it wouldn't let me move messages or delete them, I would get the following message: Network unavailable, please try again later. Does anybody know why this is? The gmail app works fine offline in this manner as does my other android phone email apps I've used. I got the same messages for both a Gmail and an exchange account while offline in this app. Thanks!