Hello Rimma,
Thank you for posting here in Microsoft Community.
To answer your question, here's how to switch from working offline to working online in Outlook, please follow these steps:
- Open Outlook.
- Click on the "Send/Receive" tab in the top menu.
- Look for the "Work Offline" button in the "Preferences" section.
- If the button is highlighted, click on it to turn off the "Work Offline" mode.
- Once you have turned off the "Work Offline" mode, Outlook will start to synchronize with the server and you will be able to send and receive emails.
You may also refer to this article: Work offline in Outlook - Microsoft Support
If you are still having issues switching from working offline to working online, please let me know and I will be happy to assist you further.
Best regards,
Arquel C.
Microsoft Moderator