Outlook calendar disappear from inbox after accept the request

The provided "ounce of prevention" instructions are spot on! However, when faced with the immediate dilemma of needing the email... one goes to the Deleted Items folder to find the email, BUT (because the invitation email may be prevented from opening by Outlook) one must click Reply to then be able to once again read (and hyperlink-click) the original email entries.

In Outlook, this is found under the File tab. Click Options, then Mail, and scroll down to the Send messages section. Uncheck the box next to Delete meeting requests and notifications from Inbox after responding