I have set up a replacement computer for a friend. they have a virgin,net email address. The PC is with Windows 10 and Office 2019.
I let Outlook set itself up (imap settings) and all seemed to work reasonably but with some hesitation when updating the Outlook folders. The email is now being reported by my friend as being "slow and erratic" with some emails taking up to 12 hours to arrive.
I am going to check the mail settings but is something else going on here? His old system used POP3, luckily, when it crashed I was able to retrieve the Outlook files and rescue his emails. I set the new system to use IMAP to avoid this issue in future.