The IMAPITable::FreeBookmark method releases the memory associated with a bookmark.
HRESULT FreeBookmark(
BOOKMARK bkPosition
);
The IMAPITable::FreeBookmark method releases a bookmark that is no longer needed. The bookmark is no longer valid after this call. Whenever a table is released from memory, all of its associated bookmarks are also released.
If the caller passes one of the three predefined bookmarks in the bkPosition parameter, ignore the request and return S_OK.