While working offline, you cannot move or copy messages that were not downloaded for offline use. From the Mail window, open the File menu, choose Offline, then uncheck Work Offline, and then try again.
U kan nie terwyl U aflyn werk boodskappe skuif of kopieer wat nie vir aflyngebruik gekopieer is nie. Uit die Pos-venster, open die Lêer-kieslys, kies Aflyn, en ontmerk 'Werk aflyn', en probeer weer.