Hi All,
Some users complain that some messages in their mailbox have the new message icon and message have marked as read.
I used MFCMapi.exe and verified that the mailbox that reports this problem, the message has a property call PR_ICON_INDEX and the other doesn’t have this property.
In the post https://learn.microsoft.com/en-us/office/client-developer/outlook/mapi/pidtagiconindex-canonical-pro... we can see the value of the PR_ICON_INDEX properties and the message with this issues have the value of 0x00000000 and this value does exist in the article.
If I delete this property, the icon disappears.
My question is:
Why this mailbox have different behavior?
Why the property PR_ICON_INDEX of the message have the an unknown value of 0x00000000?
We have Exchange Server 2019 CU14 Mar24SU on-premises, Outlook 2016 and use OWA to access the mailbox.
