Folder.MarkAllItemsAsUnread method
EWS Managed API
Marks all items in folder as unread.
The MarkAllItemsAsUnread(Boolean) method is applicable for clients that target Exchange Online and versions of Exchange starting with Exchange Server 2013.
Assembly: Microsoft.Exchange.WebServices (in Microsoft.Exchange.WebServices.dll)
Parameters
- suppressReadReceipts
- Type: System.Boolean
true to suppress sending read receipts for items; otherwise, false.