Qt3 and Qt4 at the same time [Windows]

[bitChanger]

I don't use the MSVC integration, sorry. Maybe someone else has insight on that one.

[Brandybuck]

Figure out which one you want MSVS integration with, then do without it in the other. Really. You can get by without the integration. It's only a minor annoyance unless you choose to make it a problem.

[bitChanger]

Another interesting trick: (working on Qt 3 and Qt 4 at the same time)

If you change your env QTDIR=3.x.x and open a Qt version 3 project in MSVC.
Then change your env QTDIR=4.x.x and open a Qt version 4 project in MSVC.

Each instance of MSVC will have the path it needs, so you can compile and run both projects at the same time using two versions of Qt.

This is of course until you close and reopen, then it will take whatever the current env setting is.