Symptoms

When performing upgrade of subscription from Exchange 2010 to Exchange 2013 following the guide, following error is displayed in POA:

Could not upgrade organization '<OU>' to next Exchange version. Migration of subscription <SUB_ID> from Exchange Server version 2010 to 2013 is not possible. 

or in PBA:

Change Service Plan failed: Parallels Operations Automation error #extype_id #115, module_id #Exchange, Migration of subscription <SUB_ID> from Exchange Server version 2010 to 2013 is not possible.. . 

Cause

Migration of subscriptions from Exchange 2010 to 2013 is available in POA starting from update POA 5.5.3, please see the release notes

Resolution

Upgrade POA to version 5.5.3 or higher.

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