UCCX Version 10.0 does not support Windows-to-Linux upgrades. This means that any UCCX version from Version 7.0(2)ES3 and earlier cannot be upgraded in a single step to UCCX Version 10.0. Windows UCCX installations must first be upgraded to the latest Service Update (SU) on Version 8.5(1), or to the latest SU on Version 9.0(2). Then, that version can be upgraded to UCCX Version10.0. As of November 15, 2013, the interim versions for Windows to Linux upgrade to UCCX 10.0 were 8.5(1)SU4 and 9.0(2)SU1.
Refer to Cisco Unified Contact Center Express (Cisco Unified CCX) Software and Hardware Compatibility Guide for the latest information on UCCX upgrade compatibility.
For a fresh installation you would lose all historical data, you would need to manually migrate settings and configuration, it may be a good time to review what is actually in use on your current UCCX and only migrate what is required.
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