As with many things open source a couple of years is a long, long time; Nextcloud has improved a lot as far as I can tell, for me it's decently usable and surprisingly problem free.
How's Sogo with regards to maintainability and upgradability?
How's Sogo with regards to maintainability and upgradability?
And here's the money quote: "The effort has been quite successful. Of the tens of thousands server owners who were informed, over 5% had upgraded already in the first ten days."[1] In other words 95% were left vulnerable and they were responsible for it. Does not inspire trust.
[1] https://nextcloud.com/blog/nextcloud-releases-security-scann...
It's really, really, nice.