Outlook 365 intermittent error 0x800CCC0F

[jellyroll]

I am using Outlook 365 and have a blueyonder.co.uk e-mail address. For some time I have been experiencing this error message when trying to Send/Receive. It is an intermittent problem but happens often enough to be annoying.

I have done a repair to Outlook using the Microsoft Support & Recovery Assistant and also a repair using Control Panel, neither of which seemed to make any difference. The error message is shown in the gif below

Is there a solution for this?

[Graham_A · Accepted solution]

Whilst the older legacy domain settings should still work, you may find that using the recommended settings provides a more robust service:

https://community.virginmedia.com/t5/Email/Email-settings-change/td-p/3369438/jump-to/first-unread-m...

[jellyroll]

Thanks for your reply. The account settings for Outlook 365 are harder to follow than in previous versions but I have compared my existing settings with the recommended settings as best as I can and the only thing I have changed is the SMTP server name from smtp.blueyonder.co.uk to smtp.virginmedia.com. So far, no problems.

[jellyroll]

I am still getting this error intermittently but not so often as before (I think). One of the possible reasons I have found by searching is corrupted .pst files.

In my Outlook settings it says there are 2 pst files stored in C:\Users\myname\Documents\Outlook Files and they are archive.pst & pop.virgin.net.pst. However, I also have about 8 pst files in C:\Users\myname\AppData\Local\Microsoft\Outlook. I assume these 8 files are historical so can they be deleted? If I can delete them, might that be sufficient to stop the error messages?

[jellyroll]

All the time I was experiencing these 0x800CCC0F errors, my PC was connected to my hub (which was in a different room) using Powerline adaptors. I recently had a Virgin engineer re-locate my hub to the same room as my PC and they are now connected directly by an Ethernet cable. Since then, I have never had a 0x800CCC0F error! Is this just a coincidence?

The reason for making the switch was to improve my download speed. I was only getting 100 - 120 Mbps using Powerline adaptors (so I was suspicious about my domestic electricity circuit) but now get 200 - 220 Mbps.

[Robert_P]

Hi jellyroll

Thanks for the update and glad to hear this is now working for you following the recent visit and relocation of the Hub.

If you need us again in the future, please don't hesitate to get in touch.

Rob