Logically, there is no difference between non resident ordinary account and ordinary savings deposit account
NRO account is maintained by Non resident Indians
Normal savings account is maintained by residents]
When NRI returns to India for permanent settlement, he has the option to close his NRO account. During the manual environment, it was easy for the commercial bank, to convert the NRO account into normal savings account easily
However, as at present on account of introduction of core banking solution, each account has different account number categorised under the respective category.
As such it is not possible to convert the NRO account to normal savings account since both have different classification (software program); however, some banks have the system of such transfer and it is possible in some banks on account of such transfer provisions in their system