I heard that Unified Communication Manager/Unity Connection 9.0 is End of Software Maintenance. Is it true? There isn't any option to download the upgrade software for UC/UCM 9.0(1) from Cisco.com.
Though .0 releases tend to have short life span as .1 release come out after them, you should be looking at upgrading to 9.1 which has been out for some time now.
HTH,
Chris
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