[cisco-voip] 8.6 Upgrades L2 Upgrade vs Refresh Upgrade

Mon Aug 15 11:51:24 EDT 2011

Per the Release Notes;

For CallManger 8.6 is L2 Upgrade, upgrades using Inactive partition.
For Unity Connection 8.6 is a Refresh Upgrade (wipes drive, 128GB  USB required)

How come they aren't both a Refresh Upgrades? Why the difference under the hood?

https://supportforums.cisco.com/community/netpro/collaboration-voice-video/unified-comm-application/blog/2011/08/11/checklist-before-upgrading-to-unity-connection-86

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