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Is it possible to edit contents of e-mail messages (including headers) in any mailbox stored on Exchange Server (Exchange Server 2010 SP3 UR2 -

Or, alternatively, edit the email messages in the OST file (of MS Outlook), so that they then can be synchronized with the Exchange server?

PS. This is necessary for the same functionality as in this email editor in Gmail: Signal Extension for Chrome

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This would seem to open some doors to possible security issues. Can you explain the intent of such changes? –  Dave M Nov 1 '13 at 15:51
Seconded. Understanding the actual big-picture problem that you're trying to solve may help us give you a better answer. –  mfinni Nov 1 '13 at 19:13

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I don't know of any native functionality to do that.

It doesn't look like that "editor" actually changes anything on the Gmail servers, either, since the reviews say that it doesn't sync the changes. I'm guessing that extension stores all the edited content in the browser's app directory.

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I don't know how they do it, but I know Mail Disclaimers by Exclaimer can change your Sent Items to show the outbound disclaimer that went out after their software intercepts/massages the outbound email on an Exchange server. Now...whether that's manipulating an existing Sent Items message or replacing it with a duplicate that has both the original message and the appended disclaimer, I don't know. So maybe it is possible, but beats me how it would be done. –  TheCleaner Nov 1 '13 at 16:27
Also, I'm not smart enough to understand this, but maybe it is a step in the right direction: code.msdn.microsoft.com/office/… –  TheCleaner Nov 1 '13 at 16:29
@TheCleaner - the first thing (disclaimers) is added by a mail-transport process while a message is being transmitted, not changing something that is already stored in a mailbox. The second is something that acts like a mail client to make changes to a Draft email, which, of course, is native functionality. –  mfinni Nov 1 '13 at 16:38
Looks like the "sent items update" service will replace the mail in Sent Items, it doesn't edit them as-is. Makes sense. –  mfinni Nov 1 '13 at 16:50
Yeah, a replace makes more sense. I think the real question is "Why OP?"...they may be just looking for some kind of rules/agent for better processing. –  TheCleaner Nov 1 '13 at 18:50

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