Client-Software-version in MAPIClientAccess logs are wrong

Hi

I have an odd problem.

The Client-Software-Version that is shown in the MAPIClientAccess logs(C:\Program Files\Microsoft\Exchange Server\V15\Logging\mapi Client Access) does not match the versionnumber on the outlook.exe file on the client.

In the MAPIlogs ist says like *,,OUTLOOK.EXE,15.0.5125.1000,Classic,*", but when I go in Outlook and look at Info about Outlook it says the version 15.0.5172.1000 (so does the version when I right-click on outlook.exe, properties, details)

This happens on all OutlookVersions (2010-2016)

(Exchange2013Cu23, latest patchlevel)

Anyone knows why this is?

Thanks in advance

/Peter