Hi ,
just in case anybody interested…
I tried to deploy Office 2016 via z-push to about 50 clients. All tested with win10, but some still have win7x64.
Those win7 clients aren’t able to connect to z-push … win10 is working fine.

The Problem is, win7 is unable to support some newer TLS version, so if you have nginx in front of z-push and just TLSv1.1/1.2 this will not work out of box.

Put in the correct regkey (without reboot!)

Windows Registry Editor Version 5.00

[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Internet Settings\WinHttp]
"DefaultSecureProtocols"=dword:00000a00

[HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\Internet Settings\WinHttp]
"DefaultSecureProtocols"=dword:00000a00

Details:
https://support.microsoft.com/en-us/help/3140245/update-to-enable-tls-1-1-and-tls-1-2-as-a-default-secure-protocols-in
in some cases you might have to install the hotfix mentioned in that article.
Thanks to the Kopano Support Team for that useful information!!!