MRO (Microsoft R Open) is the enhanced distribution of R from Microsoft Corporation. One of the goals of MRO is to provide the community with an easy-to-install binary distribution of multi-threaded R.
MRO and MRS are R engine based on base R. MRO and MRS are 100% compatible with R in terms of functions, packages, and IDEs. While everything you do in R can done in MRO and MRS, the reverse is not true, due to the additional components in MRO and MRS.
MRO:
MRS: