Behavior:
The following error message appears, when trying to store an email with big attachments via Connect to Outlook:
Object reference not set to an instance of an object
Solution:
Open on the Web-Server, where the Platform Services are installed the web.config (Default path: C:\Program Files (x86)\DocuWare\Web\Platform\web.config). Search for "security" and put the red marked lines inside the "security"-tag:
<system.webServer>
…
<security>
<requestFiltering>
<requestLimits maxAllowedContentLength="209715200" />
</requestFiltering>
<authentication>
<windowsAuthentication enabled="false" />
</authentication>
</security>
…
</system.webServer>
The value equals 200MB.