EDIT 3/31/2008: We have posted the updated public folder guidance for versions of Exchange past Exchange 2007; you might want to read it. A frequent topic of discussion with cu...
Updated Jul 01, 2019
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First, I noticed that you're still calling the product E12, and that it wasn't announced as part of Office 2007 last week. Does this mean it's not a part of Office anymore (again)?
Second, two things we also use public folders for here in addition to sharing messages with a workgroup:
1) Shared/generic e-mail addresses that we don't want to set up as a distribution list. It seems like creating a public folder has lower overhead than maintaining a separate user account for a generic mailbox.
2) Easy way to move e-mail messages between users when a user is retiring or taking a new position. Before they leave, they can move any e-mails they wish to pass along to a public folder, and the new employee can claim them and move them back to their inbox.
Second, two things we also use public folders for here in addition to sharing messages with a workgroup:
1) Shared/generic e-mail addresses that we don't want to set up as a distribution list. It seems like creating a public folder has lower overhead than maintaining a separate user account for a generic mailbox.
2) Easy way to move e-mail messages between users when a user is retiring or taking a new position. Before they leave, they can move any e-mails they wish to pass along to a public folder, and the new employee can claim them and move them back to their inbox.