Does Archive Manager archive items in the Outlook "Drafts" folder?
Archive Manager does not archive items in the Drafts folder. This is by design.
The messages in the Drafts folder are IPM.Note messages, the same as other messages in Exchange. However, since they have not been sent yet, they do not have all required attributes to generate a checksum.
Therefore, Archive Manager cannot archive these messages and they will be skipped.
There is currently no way to 'force' Archive Manager to capture these messages. However, these messages will be archived once they have been sent.
Draft message may display a sent time: