Hi
A couple of things to add to this, firstly I have now run my standby MFP machine, this has had no recent updates for sure, and is a different OS this one being Windows 10. So totally different HW, SW and AV/FW etc - nothing changed since it last ran MFP at the weekend.
Same problem though so I am sure it is BF now.
To expand on the error I see if I try to view the exchange web page through the pages displayed in MFP I come to this.
PLEASE UPGRADE YOUR BROWSER TO VIEW EXCHANGE+
We built the new Exchange+ experience using the latest technology. This makes it faster and easier to use. Unfortunately, your browser doesn't support this technology.
My browsers are all up to date and this seems to be some complication with the site.
However I have no idea how I would change which browser MFP uses to load up so can't see of it is limited to whichever one it uses by default.