I just installed the update and things are back to normal.
At least if I use the Kopano Deskapp or Kopano Webapp. Mails in Outlook 2016 are completly messed up.
There are elements missing (e.g. mails from today), I see several hundrets of empty email in my inbox (no date, no subject, no text) 
I allready performed a full resync from the Kopano OL Extension with no succsess.
Before the update (yesterday) to version 8.6.8.2 everything was okay and in sync.
Im using MS Outlook 2016 together with Kopano OLE 2.0.328.
Any suggestion how I can get this fixed?
Thx and best regards
Thomas
Update: I have downloaded the latest version of OLE version 2.0.331 - it gives me the same result
Update 2: I guess it it makes more sense to open a new thread for this.
-> Mails in Outlook 2016 no longer consistent after upgrade to Kopano Core 8.6.8.2