The first thing which always comes to mind is that 7.3 uses SMB2 while
earlier versions defaulted to SMB1. You could put SMB2 on 7.2 but it
wasn't the default.
If you get recent fixes on 7.3 and your Windows machines it's not such an
But the knee jerk reaction many people did was open their 7.3 machines to
all sorts of security holes by disabling SMB2 and going back to SMB1.
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