Lync historie not shown but saved in Outlook

Hi all,

i have a similar Problem as described in this old thread: https://social.technet.microsoft.com/Forums/office/en-US/c1461058-0be6-435d-9ff9-1e5123ce022f/history-lync?forum=ocsclients

One of our users can't see his lync historie, the field is simply empty but all conversations are correctly stored in the Outlook Folder.

- There is no Outlook cache Mode in use
- EWS Settings seems correct
- Checked client suggestions at https://lyncdude.com/2014/05/27/complete-guide-for-troubleshooting-lync-outlook-clients-integration/

We are using Lync 2010, Outlook 2010 and Exchange 2010, all up to date

Any additional idea what can be checked to fix this issue?