Microsoft Graph Calendar API
A Microsoft API that helps customers navigate their day and enhance productivity.
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I have been having this issue for weeks, at times Outlook's Calendar will not save appointments, the issue seems to happen when I close outlook (and I have a appointment window open when I close Outlook), yet when the pop-up and asks if I want to save it I always say "Yes", here is a example one is a hard copy I had printed out and was closing outlook right after and what the same appointment looks like right after.