Hello, did you really wanted to create a hourly project with rate 250 USD/Hour?
I am a dveloper with more than 10 years experience with Delphi and other tools. I have experience with FMX, mainly with desktop apps for Windows and Mac, but have created some simple mobile apps too. I have a complete MS Exchange API for Delphi with a test application. See the project "Ews tester" application in my portfolio. It is not trivial to connect to EWS (Exchange web services) from Delphi as the Delphi wsdl importer imports the service incorrectly, also some features required for EWS are not exists in the importer (such as polymorphism). I can send you a test app if you want to try it. I can also give you an API itself for some bucks...