I've gotten myself stuck while trying to create a mail account on an almost freshly installed High Sierra. I get through the account creation wizard easily enough, but when I get to the window asking 'Select the apps to use with...' and click 'Done', the same window reappears, the only change being the 'Done' button is replaced by 'Next'. Clicking 'Next' has no effect.
There seem to be a few threads on discussions.apple.com dealing with the same issue, and they recommend things like deleting the ~/Library/Mail and ~/Library/Containers/com.apple.mail directories. I've tried all this, had no effect whatsoever.
I've tried adding a different generic email address, with the same result. I tried adding a Gmail address and that worked. I tried adding the account on a different High Sierra machine, and that worked OK too.
What can I try next?
Thanks as always for suggestions.