How do I set sharing permissions from the admin server on folders of those using Outlook Web Access?

I have workers who are remote from the admin office and are using Outlook Web Access to send and receive mail and share calendars.  They are using Windows Vista and Firefox.  (Firefox is being used because Explorer would not allow them to type the body of a message in Outlook Web Access but Firefox will allow it.)  They are using Outlook Web Access because Vista has not been compatible for them to make a VPN connection to the server.  
I have been able to set permissions to share their calendars by bringing their laptops back to the office and plugging into the local network so that the option to share a folder would show up via use of Outlook without the Web Access connection.

I would like to know of a way to, from the server, set permissions on these workers journals to allow sharing, as these workers are now hundreds of miles away and making journal entries that are meant to be shared but cannot be seen by the business owner/boss who is located at the office/server location.  

I know how to set permissions on folders on the exchange server, in general.  But I have only found one way to set sharing on Outlook folders such as the calendar:  doing so from Outlook (not web access version) and from on the computer of the user's folder that is wanting to allow others to see their calendar/folder.  I'd like to do this from the server as the administrator.

PS :  I've  selected Pacific Standard Time Zone because it matches my actual time, now.  I physically in the Mountain time zone area but it is 8:26 PM here.

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caggianoAuthor Commented:
I set up an email account on a computer directly connected to the server's network for the user account whose settings needed change.  This way I could open the full version of Outlook with all options available for that user's account.  I changed the settings at the office on that computer.  I did this for each user account.  It was a bit time consuming as it required opening Outlook as a user would normally do, deleting the existing exchange email account (as Outlook only allows one exchange account at a time), closing Outlook, adding a new exchange account from the control panel's mail icon for the next person whose settings needed changed, re-opening Outlook to set permissions; then repeating this process for each remote user who is unable to connect via VPN.  There is probably a better way to get this done, but this is the workaround I found.

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