If a user has been granted rights to see another user's calendar in webmail, then that permission will allow them to see the calendar in Microsoft Outlook as well.
The Icewarp GroupWare Connector is needed for this. To add a shared calendar into the connector use the current account you have already set for your own address. Click [Change] option and choose Shared Accounts tab. There specify an address of accounts (each on a separate line) you want to show.
After saving the account, new Personal Folders will be created in user's MS Outlook.
If user wants to remove shared address (his/her Personal Folders) he/she will have to only remove appropriate address from Shared Calendar tab.