DistinguishedFolderIdType Class
Exchange Server 2010
The DistinguishedFolderIdType class identifies Microsoft Exchange Server folders that can be referenced by name. If you do not use this class, you must use the FolderIdType class to identify a folder.
Namespace: ExchangeWebServices
Assembly: EWS (in ews.dll)
ExchangeWebServices Namespace
Assembly: EWS (in ews.dll)
Reference
DistinguishedFolderIdType MembersExchangeWebServices Namespace