I finally uploaded my builts of Qt v5.6.1 (snapshot) and Qt v5.7.0 Release Candidate, you can check them out at the Precompiled Qt4 and Qt5 page.
I was able to build Qt v5.7.0 RC with MSVC 2013 and 2015, older compilers seem to have issues. As for Qt v5.6.1 it was not possible to build with MSVC 2008. Since the compiler has been dropped upstream and I don’t use it either, the choice to drop it was easy.
I will most likely build another set of v5.6.x and v5.7.x once newer versions as out. Qt v5.7.x will most likely be release within June and maybe v5.6.x will also get to v5.6.2.
The builds are untested, so if you have issues leave me a comment, I can probably help.
Note also that I have moved older Qt builds to a separate Qt4 and Qt5 (Past Builds) page.