Hello, in TRUNK (r48246) I believe I have identified an issue regarding attachments on some Android Devices. Unable to download or view attachments (Images or Text Files) on an Android 4.4.2 device. Getting connection to server failed. The rest of the message is fine, even images within the message.
However I have found it is working on an Android 4.0.4 device. Should be noted that eSync with Android 4.0.4 devices has never been good I always assumed it was a poor Active-sync implementation in that version of Android so the fact it is downloading attachments is likely a fluke.
No apparent issues with iOS devices.