Check out outlook.com
That’s Microsoft so no thanks. There data files are proprietary and also not too import/exportable with the data files of other Email systems, many of which take a more open/compatible approach with their data files. I once had to leave a client stuck in outlook because she did not want to pay my extra costs it would have required (an other application tool) to get her outlook data exported out of outlook. It is even difficult to outlook data from an IMAP outlook account into an outlook POP account - even those two modes in outlook use different data files, the data of which was not all transferable.