I set a category for a mail message before I send it. When the person replies, that category is no longer assigned to the mail message.
In Outlook 2003, doing the same thing would have the category still set on the reply message.
I'm in a corporate Exchange server world, is there something that needs to be enabled on the server or maybe my client? I liked this feature in 2003, but after migrating to 2007, the feature is gone.