No bug was opened to support the incompatibility raised.  The documentation is correct.Regarding the other query about role based partitioning (multi-tenant?) in Connection, it's on the long-term roadmap to make it native in the application.  However...

This is a true statement and the documentation is correct.Any version of Cisco Unity Connection 2.x or later is supported for use with any version of Cisco Unified CM 4.1(3) or later. Can you forward me the case number?  briward@cisco.comHeath WardTM...

Per the Unity Connection Migration guide(s) you should not do migration operations during business hours ""Caution Do not migrate subscribers during normal business hours. http://www.cisco.com/en/US/docs/voice_ip_comm/connection/8x/upgrade/guide/8xcu...

You can use the client on 64bit Windows, just not 64bit Office.  The Office 64bit is on the roadmap for the product, but no date has been assigned yet.http://www.cisco.com/en/US/docs/voice_ip_comm/connection/compatibility/matrix/cucclientmtx.html

I'm sure you're aware of this documentation, but I thought I'd post it too.  http://www.cisco.com/en/US/docs/voice_ip_comm/connection/2x/administration_cmbe/guide/6xcucmbesag040.htmlBut yes, you can use auto attendant for other areas of the product t...