How do I keep the original message in the inbox after it is replied to or forwarded in outlook

Hi @Hal Reirson

Welcome to our forum!

Does the error occur on the Outlook desktop client? To further confirm if the issue is more related to Outlook desktop client, if possible, please log in to your web mail and do the same test to check if the issue persists. 

If the issue persists, it is recommended please check if there are some rules about 'Move' or 'Delete.

If not, here are some other steps you may want to take:

• Use Microsoft Support and Recovery Assistant (SaRA) to have a basic check.
• Check your view setting (View>Change/Reset View) and ensure it shows all emails and not just unread messages in this folder.
• Check File> Rules and Alerts to see if there is a client rule causing the problem.
• Please go to File>options>Mail to check the setting shown below.

If all above do not help, considering data file corruption, it is proposed that you create a new profile, re-add your account to the new profile and check if the same error still occurs. 

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Hi, Hal, just to be clear, the original email should stay where is/was. Here is one I replied to earlier today.