calendar apps

We are seeking someone who can make a client that can both be installed on a client PC and server and make it possible to transfer data from calendar to our mysql database. It is typically from Outlook, Exchange, Google Calendar and more - A company has these calendars on their client machines / server and through that apps so these data could transfer there for us when changes occur or at a particular time. More Explanation Actually, we have telephone service for our customers and will even use open exchange - we are looking for someone who can make a program that customers can installlere on their servers and client machines and have copied information from their calendar systems such as Exchange, Outlook, Citrix, google calendar go to our calendar, so we should not enter the 30 systems, but all information go to our calendar for the employee concerned