Outlook 2016 for Mac error

Outlook 2016 for Mac error

I have end users who are having trouble responding to messages I send via the service desk application. They are able to wirte out the message but when they send the reply a message pops up saying that Outlook was unable to save the message. This only happens with e-mails that the end users reply to, they are able to send new messages normally. Also this only happens with Outlook 2016 for Macs.

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