We are deploying the CommVault email archive solution but we have come across a problem. We have deployed the CVArchiverAddin to all our laptop\MS Surface Pro using Outlook 2016. User access their email via Outlook on the end user devices over a VPN connection and Outlook is cached locally.

When the VPN is not connect users are able to access Outlook locally via outlook cache (OST).  Access to Exchange 2016 on-prem is not possible over the internet and current the the cccenter https:\\cccenter.xx.com is not internet facing.

The problem is the following when we have complete our testing

Accessing Outlook and the sub emails working over VPN works fine

No VPN but internet access Outlook via OST file works fine until you try and access old archive email causes outlook to hang and you have to end task to shutdown outlook

No VPN and disable internet access (Wifi or 4g) accessing Outlook offline and old archive emails works fine can even search for email content within old emails

What can be done so when the users are using Outlook offline with no VPN running and they are still on the internet they can access their archive email without outlook crashing.