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If configured to display Archive Explorer inside Outlook and Vault Cache is in use then Archive Explorer will only show the contents of the local cache. If that is just the default mailbox then that is all you get.
You may get closer to the behaviour you require by changing the "Exchange Desktop policy | Advanced | Outlook | Launch Archive Explorer" setting to "Separate browser". The button in Outlook will then launch AE in a browser where all accessible archives should be visible. You will also loose the optimisation of getting the item content from Vault Cache rather than from the server over the network.
The setting doesn't seem to apply even after re-syncing the mailbox (numerous times), restarting client and re-syncing cache, is there a client registry setting I can check to see if this is applying?
I can get this setting to work on a non-cached Outlook client (no vault cache either) but not on a machine with Outlook cached mode (and a vault cache), is this expected?
I'm testing different Outlook add-ins in case they affect the behaviour.
Following up on this, I can only get the "Launch Archive Explorer"/"Separate Browser" setting to work in online Outlook. When using Outlook cached mode it only ever launches within Outlook.
Is anyone aware of a client (registry?) setting to confirm the setting has applied?
Another follow up, I could not get the Launch Archive Explorer in a Separate Browser to work on my cached Outlook PC. I have now logged a support ticket. So far (4 hours of webex) it still doesn't work.
FYI From my online Outlook PC I see all of the archives I have access to via the "In Outlook" Archive Explorer which is the desired behaviour we'd like for Cached Outlook. Launch Archive Explorer in a Separate Browser also works as expected on this setup.