If you want to upgrade your NetScaler Firmware but in the meantime you use XenMobile, you should not do it …
With NetScaler Gateway 12.0 build 41.16, mail sync fails for XenMobile Secure Mail on iOS and Android devices.
With NetScaler Gateway 12.0 build 41.16, mail sync fails for XenMobile Secure Mail on iOS and Android devices.
Citrix recommend that you do not update the NetScaler supporting your XenMobile infrastructure to version 12.0 that was released at the end of April.
This issue will be fixed with the next NetScaler software release.