I got thrown into a situation where I was asked to simply install Exchange 2010. The company has an IT staff, but they left out telling me that what they really wanted was to migrate a company from one e-mail system (POP3) to Exchange 2010, and they had already devised a plan to do it. They have about 150 users spread over a few locations.
Once I was well into it, it was clear that they had more in mind: Their intent is that they already bought a .net domain for Exchange that corresponds to their .com for POP3, and they intend to forward everything from the .com POP3 accounts to the .net Exchange accounts. They never really told me of this plan before I started, and as a sub-contractor, I was not even in on any of the preliminary discussions.
I am 100% sure that Exchange is working properly, and is in place. They are having problems with things like the reply from and other things related to the dual systems. I have my doubts these problems will be solvable, and that they should just make a fast move to Exchange and be done with it. The problem is that I doubt they will do this.
Since they are not far into the actual migration phase, are there any better ways to do this? Especially a better way to run them side-by-side, or should they just get everything prepared, and make one big move (which I am sure they will fight this idea)?