We just moved from POP3 (local PSTs) to Exchange Online. I migrated over 50 accounts and for the most part, it has gone VERY well.
Our VP of HR just reported to me that one of her imported contact Distribution List is dropping people out of the list when sending. She will add the group (called scheduling) to the email, hover over it and see everyone in it. When she sends, one user will drop out of the list. Her Distribution Lists were made when on POP3 but it still sends to everyone else on the list.
What could cause this drop? If she sends a mail to this person directly, it will work.
This user is using Outlook 2010.
Thanks...
Brian