Dear samir naji,
Welcome to Microsoft Community.
According to your description, the email history on your Hotmail account suddenly disappeared. Don't worry, you can try my suggestions below, I hope my suggestions can help you.
- First of all, I want to explain to you that the email synchronization in Outlook is synchronized with the Outlook email server, that is, the Outlook web side. If you use the Microsoft domain email (@Outlook.com, @Hotmail.com, @live.com, @msn.com), You can try logging into the web version of Outlook (Outlook.live.com) to check whether these emails exist.
- In addition, you can check Deleted items and recoverable items for the presence of emails, if so, you can select these emails and restore them.
- You can try switching devices, such as switching to a different computer or phone, to check if the emails are in your Outlook.
- If none of the above solutions can help you find these emails, I can only recommend that you contact Microsoft's online support staff to ask for help, you can click on this link and follow the step-by-step instructions below to contact them. Contact - Microsoft Support
1). First, enter your question in the search, then click "Sign up to contact support" at the bottom of the page.
2). Currently logged in to another valid Microsoft account. (Please make sure you sign in with your personal Microsoft account, not your work and school account, or you won't see option 3、4、5.)
3). Under "Products & Services", select "Other Products".
4). Under Categories, select Manage my Subscription and then click Confirm.
5). Click Chat with Support Agent in web browser.
Please contact Microsoft online support staff during business hours.
I hope this information has been helpful. If you have any questions, please let me know and I will be happy to help you further.
Have a good day.
Best Regards,
Jim - MSFT | Microsoft Community Support Specialist