I have no idea what caused it – though I suspect Microsoft’s recent update may have been involved – but all of a sudden, clicking any links in Outlook emails gave the message:
Your organization’s policies are preventing us from completing this action.
I had two lengthy sessions with Microsoft support, but that didn’t get me anywhere. In the end, I downloaded an automatic fix and that sorted it. If you try it yourself and you’re using Windows 10, use the download link for Windows 8.1.
I still don’t know what the problem was. I’d tried resetting Internet Explorer and changing program defaults as suggested in that link. Support also tried it, plus we tried uninstalling an app that might – and I mean “might” – have been involved, but all to no avail. The automatic fix appears to do exactly what we’d tried manually.
All sorted now.