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Question Can I update Horde to newest version?

Atramasis

Basic Pleskian
I use Plesk version 17.5.3 with Horde 5.2.13, there is a newer official stable version avalable (5.2.21). Can I just update horde following the official way (Horde PEAR server) or do I have to take care of Plesk specific things or is it a bad idea to do it at all?
 
The best solution is to wait for the official update from Plesk.
 
And the second best?
I did manage to install v. 5.2.21, I just had to force install (with -f), because PHP7 is not supported by horde, but it works. Just Weather Service has to be uninstalled (pear uninstall Services_Weather).
It seems to run fine, but my hope was that ActiveSync (or CardDAV/CalDav) would work in Outlook 2016 and Windows 10 Mail, but it does not. Maybe in Horde 6, but I think Horde is just not worth waiting, there are always problems syncing with other devices.
 
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