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Dear Glenda Mallen,
Welcome to the Microsoft Q&A forum. We understand your concern about losing access to your old calendar, especially during a busy time with holidays and important appointments. I can imagine how stressful that must be.
To help you get your calendar and appointments back as quickly as possible, we need to narrow down what happened. Could you please provide a few more details?
- Where are you using Outlook? Are you on Outlook.com in a web browser, the Outlook desktop app (on Windows or Mac), or a mobile device?
- Are the appointments visible anywhere else? For example, if the calendar disappeared from your PC, can you still see all the old appointments when you log in to Outlook.com via a web browser? This helps us determine if the issue is with your account or just one device.
- How was the calendar removed? Did you accidentally delete it, or did it disappear after an update or switch (for example, moving to the "New Outlook")?
The steps to recover your calendar depend heavily on the answers to these questions.
Thank you for your cooperation. We look forward to your response and are here to help you resolve this urgently.