Watchguard X500 MUVPN version compatibility

We have a Watchguard X500 Firewall running WSM v-8.3.1 and our remote VPN users are using MUVPN v-7.3. We want to upgrade the X500 to WSM v-10.2.1 and I need to know if the MUVPN v-7.3 client software will still work with the upgrade.

Thank You