Error in outlook.live.com, can't use online version.

Disclaimer: Please note that this is the Russian Q&A Forum, and any threads should be posted in Russian. However, I will still provide an answer in English based on your initial response. 

Dear Matin Nikita

Please note that our forum is a public platform, and we will modify your question to hide your personal information in the description. Kindly ensure that you hide any personal or organizational information the next time you post an error or other details to protect personal data.    

Thank you for reaching out to the Microsoft Q&A forum. I understand you can use Outlook in the desktop (Classic) app but the web version shows empty Inbox/Sent at outlook.live.com. I am happy to assist you. Please:

1. Use the correct web endpoint for work/school mail: Go to https://outlook.office.com . If prompted that the email is used with more than one account, choose Work or school account (not Personal).  
2. If the browser signed you into the wrong (personal) account, open a Private/Incognito window and sign in again with the Microsoft 365 work account. This avoids cached consumer-session cookies that route you to Outlook.com.  
3. Confirm you’re not on the consumer site: Outlook.com (outlook.live.com) is for personal Microsoft accounts; Microsoft 365 work/school mail is accessed via Outlook on the web (outlook.office.com).  
4. If folders still look empty in the web app, check Deleted Items/Recoverable Items to rule out a view or accidental delete, then move/restore as needed.  

Microsoft 365 work/school mailboxes (including Microsoft 365 from GoDaddy) are served by Outlook on the web at outlook.office.com; Outlook.com (live.com) is a separate consumer service and will not show your work mailbox.  

I hope this helps you clarify things better.