Hello, We are going to upgrade UCCX 9.0.1 to 10.x (or 11.x). On UCCX 9.0.1 we have installed licenses with the next feature: CRS_ENH_SEAT cisco 9.0 & CRS_ENHICDSRVR. So, the questions is next Whot we should do with licenses, how to migrate/upgrade it...

Hello,We are going to migrate from Cisco Unity Express 8.6.6 to Cisco Unity Connection 9.1.2. Therefore, we need to migrate all mailboxes without data lost.So, the questions are next: is it possible? Which tools we should use and what  steps we need ...