Non-catalytic component of the RNA exosome complex which has 3'->5' exoribonuclease activity and participates in a multitude of cellular RNA processing, maturation and degradation events. In vitro, is a processive phosphorolytic exonuclease and requires a single-stranded poly(A) tail on the substrate RNA for its activity. Can complement the growth defect of a yeast mutant lacking RRP41 exonuclease (PubMed:10930416). Required for normal development of female gametophytes (PubMed:18160042). Component of the RNA exosome complex (PubMed:10930416, PubMed:18160042). Interacts with RPP4 (PubMed:11809881). Aborted ovule development after the first mitosis. Belongs to the RNase PH family.