IP Office R11.1 does not support the Windows server based versions of Voicemail Pro and Avaya one-X® Portal for IP Office. For IP Office systems using those products Avaya recommends that they switch to Linux-based versions of those services after upgrading to R11.0.
The options are:
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Install a Unified Communications Module or IP Office Application Server with the Voicemail Pro service enabled.
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Back up the R11.0 Windows Voicemail Pro data using the Voicemail Pro client.
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Restore the data onto the Linux-based R11.1 server (the Unified Communications Module or IP Office Application Server).