Background

• Microsoft Outlook can use personal storage table folders (PST files) to store emails and other Outlook information such as calendar and contact data.
  
  PST files are not intended to be shared between multiple users.
  
  

Workarounds

• Microsoft suggests workarounds for this problem, but highlights potential issues. Due to the large size of some personal folder files, it is not practical to copy them every time data has been added or changed.
  
  One suggestion is to copy only calendars, contacts and tasks, but this does not allow for full access to the information within the PST file.
  
  

Alternative

• If you are using Microsoft Exchange Server, there are various solutions to provide shared resources within Microsoft Outlook. You can easily share entire mailboxes or use the public folder functionality to provide folders that groups of users can use to store information.
  
  If shared resources are an important requirement, utilizing the functionality of Microsoft Exchange is likely to be more practical than attempting to work around the issue of being unable to share PST files.