outlook inbound email issues?

Sat Oct 24 04:39:39 UTC 2020

I have a client who is receiving 50% of their mail on outlook servers 
for the past few hours.

MX records point to:
xxxxx-com.mail.protection.outlook.com has address 104.47.38.36
xxxxx-com.mail.protection.outlook.com has address 104.47.36.36

Anyone aware of outlook issues or have someone they can poke to check 
into this?  (Both answer smtp requests, guessing a queue is backed up 
somewhere.)

thanks
bill

-- 
This email has been checked for viruses by Avast antivirus software.
https://www.avast.com/antivirus