You can share any type of Outlook folder with other members of your organization. You can grant specific levels of permission to people to create, edit, and delete information within a shared folder.
You can give full control of all or parts of your mailbox to someone by making him or her a delegate.
If your organization shares information through a SharePoint collaboration site, you can create document workspaces and assign permissions from within Outlook; maintain a local copy of document library contents in Outlook, work with files, and upload your changes to the SharePoint site; and work with SharePoint calendars within Outlook.