draft mail messages
-> Are still missing on iOS devices using native mail with an Exchange profile.
The IBM Traveler documentation / Known limitations and restrictions list the following:
"Draft mail messages are not synchronized with the server. Apple devices do not support syncing draft messages. Drafts are considered local to the device or local to the server, and never synchronized."
-> But since Exchange EAS Protocol Version 16.0, released June 2016, "Draft folder sync" is supported.
Please add support for draft mail messages sync with iOS native Mail.