A had a problem the other day that drove me nearly insane. I wanted to see the Enterprise Vault tab on some folders within a mailbox (and on a public folder). I couldn't see them.. no matter what I did.
Why? Why? Why?
The setting I adjusted/checked was:
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It was definitely set to show the tab. But countless mailbox sync's and restarts of Outlook, along with changing a different setting to confirm that the change to show the tab was in fact working, all resulted in no tab being shown.
Eventually, I found the solution.
You need the 'full' client for it to be visible, and it's documented in this article:
Article ID: 36854 - The Enterprise Vault tab is not visible on the Outlook folder properties
It's here in the Desktop Policy:
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After that (and the appropriate mailbox sync) the tab showed up!
Sometimes it's these strange things that keep me from having a full head of hair! Have you ever experienced this strange-ness? Let me know...