You have some Agave apps that can access the body of an email message through Office APIs for Outlook 2016. However, these APIs aren't available in Outlook 2013. The following APIs have been added in Office 2016:
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Office.context.mailbox.item.saveAsync
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Office.context.mailbox.item.body.getAsync
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Office.context.mailbox.item.body.setAsync
To take advantage of this functionality, install both of the following updates: