Re: Always a PC
Although there is no open source equivalent to Exchange, your IT Department should be more than capable of providing an open-source solution that is more secure and more flexible.
The main problem with Microsoft is people like you (sorry, not trying to offend...honestly); people who are so adept at seeking MS for solutions first, that you don't consider other platforms...even when you may not be the one implementing the overall service.
LibreOffice is a great Office-related product, and Ubuntu Server is flexible and more than capable with less equipment demands than MS Server. I run MS Server in a virtual machine that I used for file transfer between members of my company, and it worked great. However, something more simple and open (such as Ubuntu Server) would have done the trick had I lacked hardware resources.
The issue here is not that MS fits the bill (or not), it's whether or not people (Americans, mostly) can change their habits. Personally, I think they can. It wasn't long ago that Americans were joined in the cause of Civil Rights and the rule of law...it only took one false-flag event to change that...now we're reporting each other to "authorities" and laughing at the dismay of families who have people incarcerated for crimes without victims (here's looking at you unconstitutional drug statutes and unconstitutional pre-emptive arrests in DUIs)...
So yes, people can change.
My fiancée and I were looking forward to buying Windows 8, Windows Surface, and Windows Phone 7/8. However, as I began to see that Microsoft was not providing options to their interface (as I had so clearly experienced on Linux distros) it was clear that Microsoft was not going in the direction I would like. Add in their intentional back-doors and cooperation with the mostly-privately-owned "National Security Agency" (as "National" as the Federal Reserve, it seems), and it appears that my observations were correct...not something I would like to be correct about in this case...
I'm rambling...you get the point... If Microsoft died today, the other options would be clear to your IT Department and you would be better off for it...