1. I tried to add an office 365 Account. Autodiscovery does not work and there is no hint for the syntax. So googling around and trying around helps, but at first, I get Exception while trying. I got a Null Ref Exception when filling in the wrong data.
2. After it seems to be the correct data, It syncs and syncs and syncs forever. whoops there came a System Web Http Excetion. yeah!
3. Next try. uninstall and reinstall the Tasks App. Then I tried to reconfigure it and wait while syncing... But then: I got the next Exception and also typing Errors. There is a message that tells me about a "Technival" Error. What the heck is Technival? I would not expect such a simple misstyping in Telerik Apps... But back to the error: "Technival Error is: @p11 : String truncation: max=4000, len=4848, value='[some crypting string, looks like a base64]"" - Com'on Telerik! Why did you specify the table columns for a maxlength of 4000 and why do you not handle those expectations correctly in this App?
If this where an free App or not provided by Telerik, I would give a shit about the errors and would simply not use it. But you have established a name and also collect money for the exchange sync. So do your job pls! Microsoft has removed this essential feature in Windows 10 Mobile. But don't ask why. Its a shame.
If you need some help in resolving those Bugs, I can help you fixing them, but I need access to the source code :)