So I recently got asked by a client, "Why can't I do a check out in the Thin Client, yet I have Vault Office Installed?"
Great question, with a licence of Vault office you are entitled to check out files from the thin client.
As the above table shows, you are able to have read/write access with Vault office.
To enable this functionality, please make sure you install the Vault Office Server on the same machine as the ADMS server. this will enable you to utilize the office server functionality.