Offline Access Client doesn't start after reboot - v7.1

I have setup an SourceOne Email Management v7.1 environment.

On a client machine running Outlook 2013: I run the silent install script to install the Offline Access Client v7.1 and after a reboot the Offline Access Client is working as expected. (retrieving, caching, ... is working fine)

When we close and shutdown the Outlook process and restart Outlook the Offline Access is still functioning as expected.

When we shutdown and start the client machine the Offline Access Client isn't launched with the Outlook service. So we have to re-run the silent install script to install this Offline Access Client.

We're not using the GPO to install the Offline Access, users have to run the script manually.

This isn't the functionality as expected. Is anyone else facing this problem as well?