IPhone users lost contact with sbs 2011 Exchange mail after upgrade to iOS 8

When all our users upgraded from iOS 7 to iOS 8 on their iPhones, they couldn't sync with our SBS 2011 Standard Exchange server anymore. Worked fine before upgrade.
SBS 2011 has done all its Windows Updates.
vpn-connection connects and works fine, but Exchange 2010 won't answer.

Hi Delbekk,
Would you please let me confirm whether it was Exchange Server SP3 on the SBS 2011? Did you install necessary
Update Rollups for the Exchange Server?
In addition, please open Event Viewer and check if relevant events were logged in Application log on the Exchange
Server 2010.
Please also check if error message was logged in the Exchange ActiveSync log.
If any update, please feel free to let me know.
Hope this helps.
Best regards,
Justin Gu

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