title: Migrating a big project in MFC from Visual C++ 6.0 to Visual Studio 2005
body: <p>I am maintaining a big project (~250k loc, not counting code generated from idl) in Visual C++ 6.0, that uses Visibroker (VB for short) 5.2.1 (which is a CORBA implementation from Borland). Recently, the other module that communicates with my project was upgraded to VB 8.0 and I got a bunch of incompatibility issues. Since VB 5.2.1 is no longer supported while VB 8.0 does not work with Visual C++ 6.0, I am considering migrating the whole project to Visual Studio 2005. It is not a big change like <a href="https://stackoverflow.com/questions/977105/ever-done-a-total-rewrite-of-a-large-c-application-in-c">total rewrite large C++ application in C#?</a>, but only resolving all the incompatibility errors.</p>
  
  <p>My question is what kind of strategy should I use to tackle this task? Anyone has done this before? Also, the problem for me is the size of the project. How much effort does it take to do this kind of migration?</p>
  
  <p>FYI, the project has a frontend GUI portion in MFC and a backend CORBA portion. The two are not very well separated though. </p>
  
  <p>Best regards.</p>