I'll eventually get round to saying why I decided to do this, but for those who have to or decide to do this, either reboot the machine in-between or boot into safe mode (no networking) and then reboot into normal mode at the earliest opportunity.

The reason?
SMS creates several services that run in the background. When you uninstall SMS it marks these services for deletion, but they don't get deleted until after a reboot. Consequently, when you re-install SMS it will try to install all these services again – but it can’t as they are already marked for deletion! From what I can tell, with a normal boot SMS starts early enough to stop the uninstallation of the previous services but this isn't the case in safe mode.

I haven't experimented with fiddling around with the SMS services after uninstallation. You could always give it a try  .

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