2.2.3.174 SrcFldId
The SrcFldId element is a required child element of the Move element in MoveItems command requests that specifies the server ID of the source folder (that is, the folder that contains the items to be moved).
Elements referenced in this section are defined in the Move namespace, except where otherwise indicated by the presence of a namespace prefix (as defined in section 2.2.4).
The server ID of the source folder is obtained from the folderhierarchy:ServerId element (section 2.2.3.166) of a previous FolderSync command (section 2.2.1.5) or FolderCreate command (section 2.2.1.3). The SrcFldId element value can be up to 64 characters in length..