• Quiesced snapshots fail on a virtual machine running Windows Server 2012 with Microsoft Exchange 2013.
• In vSphere Client, you see an error similar to:
  
  An error occurred while saving the snapshot: msg.snapshot.error-QUIESCING-ERROR
  
  
• This issue occurs when Microsoft Windows Server Backup Features are not installed on the affected virtual machine.
• The vmware.log file (located at: /vmfs/volume/Datastore/Affected_Virtual_Machine/) contains errors similar to:
  
  YYYY-MM-DDT<time>Z| vcpu-1| I120: Guest: [ debug] [vmvss:vmvss] CVmSnapshotRequestor::QueryStatus():917: enter
  YYYY-MM-DDT<time>Z | vcpu-1| I120: Guest: [ info] [vmvss:vmvss] CVmSnapshotRequestor::WaitForOperation():2554: Unexpected result from QueryStatus(): 0x8004230f
  YYYY-MM-DDT<time>Z | vcpu-1| I120: Guest: [ warning] [vmvss:vmvss] CVmSnapshotRequestor::WaitForOperation():2563: Async operation result: IDispatch error #8463
  YYYY-MM-DDT<time>Z | vcpu-1| I120: Guest: [ debug] [vmvss:vmvss] CVmSnapshotRequestor::DoSnapshotSet():1357: failed call: ret = WaitForOperation(async), result = 0x8004230f
  YYYY-MM-DDT<time>Z | vcpu-1| I120: Guest: [ debug] [vmvss:vmvss] CVmSnapshotRequestor::Finalize():1908: enter
  YYYY-MM-DDT<time>Z | vcpu-0| I120: Guest: [ debug] [vmvss:vmvss] CVmSnapshotRequestor::UnregisterProviderImpl():1845: enter
  YYYY-MM-DDT<time>Z | vcpu-1| I120: Guest: [ debug] [vmvss:vmvss] CVmSnapshotProvider::OnUnload():729: 0x000000810DEB1540
  YYYY-MM-DDT<time>Z | vcpu-1| I120: Guest: [ debug] [vmvss:vmvss] CVmSnapshotRequestor::UnregisterProviderImpl():1862: Provider unregistered.
  YYYY-MM-DDT<time>Z | vcpu-0| I120: Guest: [ debug] [vmsvc:vmbackup] *** VmBackupAsyncCallback
  YYYY-MM-DDT<time>Z | vcpu-0| I120: Guest: [ debug] [vmsvc:vmbackup] VmBackupAsyncCallback: checking VssSyncStart
  YYYY-MM-DDT<time>Z | vcpu-0| I120: Guest: [ debug] [vmsvc:vmbackup] *** VmVssBackupOpQuery
  YYYY-MM-DDT<time>Z | vcpu-0| I120: Guest: [ debug] [vmsvc:vmbackup] *** CVmVssRequestor::QueryStatus
  YYYY-MM-DDT<time>Z | vcpu-1| I120: Guest: [ debug] [vmvss:vmvss] CVmSnapshotRequestor::QueryStatus():917: enter
  YYYY-MM-DDT<time>Z | vcpu-0| I120: Guest: [ message] [vmsvc:vmbackup] Snapshot operation error: IDispatch error #8463 (0x8004230f)
  YYYY-MM-DDT<time>Z | vcpu-0| I120: Guest: [ debug] [vmsvc:vmbackup] *** VmBackup_SendEvent
  YYYY-MM-DDT<time>Z | vcpu-0| I120: Guest: [ debug] [vmsvc:vmbackup] sending vmbackup event, vmbackup.eventSet req.error 5 'VssSyncStart' operation failed: IDispatch error #8463 (0x8004230f)
  YYYY-MM-DDT03:08:29.539Z| vcpu-0| I120: Guest: [ warning] [vmsvc:vmbackup] Failed to send vmbackup event to the VMX: Unknown command.
  YYYY-MM-DDT<time>Z | vcpu-0| I120: Guest: [ debug] [vmsvc:vmbackup] *** VmVssBackupOpRelease
  YYYY-MM-DDT<time>Z | vcpu-0| I120: Guest: [ debug] [vmsvc:vmbackup] *** CVmVssRequestor::Finalize
  YYYY-MM-DDT<time>Z | vcpu-1| I120: Guest: [ debug] [vmvss:vmvss] CVmSnapshotRequestor::WaitForUnregistration():2590: enter</time></time></time></time></time></time></time></time></time></time></time></time></time></time></time></time></time></time></time>

• Add the feature using the command line:
  1. Open an elevated command prompt on the system failing the conversion. For more information, see Opening a command or shell prompt (1003892).
  2. Run the command:
     
     ocsetup WindowsServerBackup
     
     Press Enter.
     
     For more information, see the Installing Windows Server Backup article from Microsoft TechNet.

Or

• Add the feature using Server Manager:
  1. Click Start > Server Manager.
  2. In the upper right-hand corner, click Manage > click Add Roles and Features.
  3. In the list of features in the Features section double-click Windows Server Backup
  4. If Windows PowerShell is not installed, double-click Windows PowerShell.
  5. Click Next.
  6. Click Install on the Confirmation Installation Selections screen.
  7. Click Close.