Offline approval for workflows in ECC4.7

Dear Gurus,

I am currently handling a workflow project for one of our clients who runs on ECC4.7. We recently activated the workflows from them. now they would like to have offline approval setup in their system. i my self did this few time but in ECC 6.0 systems.

Can we enable offline workflow approval in ECC 4.7. I dont see SAP inbox(SOIN) transaction in 4.7 system.

Can some body through some inputs on this ?.

Thanks,

rakesh.