
What detailed version of Outlook are you using? Please make sure that you have upgraded it to the latest version (File > Office Account Update Now). Please refer to this article: How to perform a clean boot in Windows. If the issue only occurs with this computer, to check if the issue is caused by any other program on your computer, reboot your computer with clean boot.
Does the issue only exist on this specific device? Can this problem be reproduced in other clients?. In order to better understand your problem, could you provide some detailed information: As a security measure, your session will time out after six hours of inactivity.Please understand that in order to protect your privacy, I have hidden personal information. (Most of Indiana observes Eastern Time.) By default, Outlook on the web will open the Inbox folder you cannot change this. The first time you log in, you'll be prompted to set your time zone. You can send and receive messages and attachments, create folders and organize messages within the folders, view calendar appointments and contacts, look up names in the IU Global Address List (GAL), set up the Out of Office Assistant, and send instant messages. The Outlook on the web interface provides basic email functionality from a secure site, and looks and feels similar to the Outlook application. If you have an Exchange account at Indiana University, you can use Outlook on the web (formerly OWA) to securely access your IU Exchange mailbox anywhere from any computer connected to the internet, without having to configure Microsoft Outlook or another email client.
(Alternatively, you could use a different browser or a private browsing window/tab to log into Outlook on the web.) Then re-open your browser and log into Outlook on the web with the appropriate IU username and passphrase. If your web browser already has an active login session for another IU account, you must first log out of your active session by closing all open browser windows or tabs. Outlook on the web uses the IU Login service.