Microsoft Corp. will purchase Nuance Communications Inc. for $19.7 billion in cash in a move that demonstrates a massive commitment to building out the Microsoft Cloud for Healthcare reported in late 2020. The acquisition, which is expected to close by the end of 2021, doubles the Redmond, Wash.-based company’s total addressable market in the health care provider space, bringing it to nearly $500 billion. The size of the transaction is notable even for a company with the active acquisition history of Microsoft.