Command Line for Vault Cache reset?

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Is there any command line switch or script to reset Vault cache reset on outlook client. Our helpdesk is finding it hard to guide the users to reset vault cache using Cntrl+Shift and clicking on EV buttons.

If there is any command line to do it, We can give an exe to users so that when they run it, it will reset the client cache.

[JosephRodgers · Accepted solution]

In EV 9.0 EV Client there is a new registry key: RemoveOfflineVault.  This might help. 

"Specifies whether to delete any Vault Caches and their related items
(current working directory, registry keys, and hiddenmessages). The
Vault Cache facility does not become available again until this registry
value is deleted."