User has iPhone, iPad and Dell Windows 10 with Outlook 2016.
The three devices are not synchronizing deleted emails properly.
They have Comcast email which shows IMAP setup on all three devices.
If they delete from iPad, message is removed from Outlook but not iPhone
If they delete from iPhone, message is removed from Outlook but not iPad
If they delete from Outlook, message is not removed from either iPhone or iPad
What should I check? Thanks.