By Gerry Shih SAN FRANCISCO (Reuters) – Microsoft Corp said on Thursday it would integrate rival Salesforce.com Inc apps into its Windows and online Office platforms, furthering Chief Executive Satya Nadellas drive to make the company more cloud-computing friendly. The main thrust of the tie-up means Salesforces popular customer-management apps will be available on Windows desktop PCs, tablets and mobile devices, while Salesforce users will be able to access Microsoft Office content such as Excel spreadsheets and PowerPoint presentations. …