Can't log into Outlook (Via a web browser)

It is possible that Outlook's server(s) had a temporary issue that didn't let you log in to your Outlook account. Such Outlook sign in problems are usually resolved incredibly fast by Outlook teams.

Reload the Outlook website by hitting the reload button of your web browser, and try logging in again.

Maybe the Internet connection you are connected to is unstable, and is the reason why you can't log in to Outlook. To test if this is the case, you can try accessing another websites (e.g. Google, Bing, Yahoo etc). If you can't access other websites or have difficulties in accessing them, it is probably an issue related to the Internet connection. Once your Internet connection is stable again, you should be able to access Outlook.

Tips to improve the stability of your Internet connection include:

• Put your router in a central position of your home, closer to your devices;
• Buy a signal booster (if you live in a house);
• Buy a stronger router.
  
  

Also, feel free to check the guides below, which can assist you with resolving a wide variety of issues related to the Internet connection:

- No internet connection
- Slow internet connection

Maybe the reason why you can't log in to Outlook is that you haven't entered the correct username and password. It is possible that you have changed the password, but you failed to update the password everywhere else where you access Outlook from.

Verify that you have entered the correct username and password and try logging in again.

Even though cookies and cached data are highly beneficial, as they help us load websites faster, over time they can become corrupt. It is possible that corrupt cookies and/or cached data won't let you access your Outlook account. If this is the case, clearing the corrupt cookies and cached data is all you need to do, to have this issue resolved, because once the corrupt ones are removed, they will be replaced with clean versions.

To learn how to clear the browser's cache (and cookies), effectively, do check the how to clear the cache solutions guide and how to delete browser cookies guide.

It is possible that Outlook has been accidentally blocked by the firewall or antivirus because they mistakenly consider it a threat, which would be a reasonable explanation why you can't log in to Outlook. 

Open the firewall or antivirus settings and check if you can see Outlook on a list of blocked items. If Outlook was on the list, you should remove it from the list, after which you should be able to log in to Outlook again.

Updating your web browser to the latest version can help you fix the issue with logging in to Outlook, as an outdated browser might cause many issues, mainly due to incompatibility with the latest trends and practices.

Check if there is an update available for your web browser and if one is available, install it.

If you are not sure how to update your web browser, do check the how to update the web browser guide.

Maybe the current web browser you are using is the reason why you can't log in to Outlook. If this is the case, although an extremely rare one, open the Outlook website through another web browser and check if Outlook would open, and if you can log in.

Maybe Outlook have technical difficulties with their servers. This is almost next to impossible, however, it should be also taken into consideration. In this case, there is nothing you can do but to wait until the difficulties have been resolved. You can always contact the Outlook team for more details, too.