When you compose a message in Outlook 2003 and choose 'Confidential' from the Options->Sensitivity box, which mail header is used to indicate that setting?
Do/will newer versions of Outlook use the same header as Outlook 2003 does? Is this process standardized?
Outlook – Mail Header for Indicating Confidentiality
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Best Answer
Or:
I checked this on Outlook 2007, I don't think there's any reason that it would have changed in 2010 (to maintain compatibility to emails sent between versions).
As to whether it's "standardized", it probably falls into the same category as most of Microsoft's cute custom headers: They're standards in Microsoft's imagination and under their roof only.