How do I fix Outlook is suddenly not sending or receiving emails?

I have the same problem. Just started today on my desktop computer using New Outlook. I'm running Windows 10. My serivce provider is Fidium. My email is working just fine in my gmail account on my desktop and on my cell phone. I've gone round and round in circles trying Microsoft help. This is really fustrating. I'm thinking it's a problem with Outlook and Microsoft. Too many variables in this post with the only commonality being Outlook.

I have tried all that even reloaded an updated email app and it has taken over eight hours and still not uploaded my emails

I am continuing to get intermittent outages, meaning New Outlook works for a couple of days sending and receiving email messages and then stops working. Stops working means I can still use the application to read existing messages or create a new one but that is it - nothing arrives and I can send. I can access all of my other Office applications without any problems.

I have yet to find any resource at Microsoft that seems to help. Thank goodness the Gmail Web UI still works, as it as for years. Mostly likely I will revert back to it and uninstall New Outlook, even though it is a much better mail environment.

(Partial copy of response to Patricia Daniel in this thread)

I did check with Best Buy's Geeksquad (where I bought my laptop) and they mentioned that anyone with a IMAP type email account used by Roadrunner on Spectrum (uses .rr in the email address) is no longer compatible with Outlook. The change was recent and the Geeksquad tech noted that they have had a number of recent cases of Outlook users with Roadrunner email accounts reporting receiving and sending email problems. The solution was to switch to using Spectrum Webmail (which isn't as good) but I can get emails on my laptop again.

I can send and receive on my phone but not on my computer. What do I do?