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+# Migration Guide for Az 16.0.0
+
+## Az.Resources
+
+### `Get-AzPolicyAssignment`
+
+The `BackwardCompatible` parameter was previously introduced to preserve the legacy `.Properties`-based output shape. This parameter has now been removed. Cmdlets always return the modern flattened object shape, and legacy access via `.Properties.*` is no longer supported. Scripts must be updated to reference first‑class properties directly.
+
+#### Before
+```powershell
+$policyAssignment = Get-AzPolicyAssignment -Name MyAssignment -BackwardCompatible
+$description = $policyAssignment.Properties.Description
+```
+
+#### After
+```powershell
+$policyAssignment = Get-AzPolicyAssignment -Name MyAssignment
+$description = $policyAssignment.Description
+```
+
+### `Get-AzPolicyDefinition`
+
+The `BackwardCompatible` parameter was previously introduced to preserve the legacy `.Properties`-based output shape. This parameter has now been removed. Cmdlets always return the modern flattened object shape, and legacy access via `.Properties.*` is no longer supported. Scripts must be updated to reference first‑class properties directly.
+
+#### Before
+```powershell
+$policyDefinition = Get-AzPolicyDefinition -Builtin -BackwardCompatible | select -First 1
+$policyRule = $policyDefinition.Properties.PolicyRule
+```
+
+#### After
+```powershell
+$policyDefinition = Get-AzPolicyDefinition -Builtin | select -First 1
+$policyRule = $policyDefinition.PolicyRule
+```
+
+### `Get-AzPolicyExemption`
+
+The `BackwardCompatible` parameter was previously introduced to preserve the legacy `.Properties`-based output shape. This parameter has now been removed. Cmdlets always return the modern flattened object shape, and legacy access via `.Properties.*` is no longer supported. Scripts must be updated to reference first‑class properties directly.
+
+#### Before
+```powershell
+$policyExemption = Get-AzPolicyExemption -Scope /providers/Microsoft.Management/managementGroups/myManagementGroup -Name MyExemption -BackwardCompatible
+$expiresOn = $policyExemption.Properties.ExpiresOn
+```
+
+#### After
+```powershell
+$policyExemption = Get-AzPolicyExemption -Scope /providers/Microsoft.Management/managementGroups/myManagementGroup -Name MyExemption
+$expiresOn = $policyExemption.ExpiresOn
+```
+
+### `Get-AzPolicySetDefinition`
+
+The `BackwardCompatible` parameter was previously introduced to preserve the legacy `.Properties`-based output shape. This parameter has now been removed. Cmdlets always return the modern flattened object shape, and legacy access via `.Properties.*` is no longer supported. Scripts must be updated to reference first‑class properties directly.
+
+#### Before
+```powershell
+$policySetDefinition = Get-AzPolicySetDefinition -Builtin -BackwardCompatible | select -First 1
+$policySetParameters = $policySetDefinition.Properties.Parameters
+```
+
+#### After
+```powershell
+$policySetDefinition = Get-AzPolicySetDefinition -Builtin | select -First 1
+$policySetParameters = $policySetDefinition.Parameter
+```
+
+### `New-AzPolicyAssignment`
+
+The `BackwardCompatible` parameter was previously introduced to preserve the legacy `.Properties`-based output shape. This parameter has now been removed. Cmdlets always return the modern flattened object shape, and legacy access via `.Properties.*` is no longer supported. Scripts must be updated to reference first‑class properties directly.
+
+#### Before
+```powershell
+$policyAssignment = New-AzPolicyAssignment -Name MyAssignment -PolicyDefinition MyPolicyDefinition -BackwardCompatible
+$enforcementMode = $policyAssignment.Properties.EnforcementMode
+```
+
+#### After
+```powershell
+$policyAssignment = New-AzPolicyAssignment -Name MyAssignment -PolicyDefinition MyPolicyDefinition
+$enforcementMode = $policyAssignment.EnforcementMode
+```
+
+### `New-AzPolicyDefinition`
+
+The `BackwardCompatible` parameter was previously introduced to preserve the legacy `.Properties`-based output shape. This parameter has now been removed. Cmdlets always return the modern flattened object shape, and legacy access via `.Properties.*` is no longer supported. Scripts must be updated to reference first‑class properties directly.
+
+#### Before
+```powershell
+$policyRule = '{ "if": { "field": "type", "like": "Microsoft.DesktopVirtualization/*" }, "then": { "effect": "deny" } }'
+$policyDefinition = New-AzPolicyDefinition -Name MyDefinition -Policy $policyRule -BackwardCompatible
+$policyType = $policyDefinition.Properties.PolicyType
+```
+
+#### After
+```powershell
+$policyRule = '{ "if": { "field": "type", "like": "Microsoft.DesktopVirtualization/*" }, "then": { "effect": "deny" } }'
+$policyDefinition = New-AzPolicyDefinition -Name MyDefinition -Policy $policyRule
+$policyType = $policyDefinition.PolicyType
+```
+
+### `New-AzPolicyExemption`
+
+The `BackwardCompatible` parameter was previously introduced to preserve the legacy `.Properties`-based output shape. This parameter has now been removed. Cmdlets always return the modern flattened object shape, and legacy access via `.Properties.*` is no longer supported. Scripts must be updated to reference first‑class properties directly.
+
+#### Before
+```powershell
+$policyExemption = Get-AzPolicyAssignment -Name MyAssignment | New-AzPolicyExemption -Name MyExemption -ExemptionCategory Mitigated -BackwardCompatible
+$policyAssignmentId = $policyExemption.Properties.PolicyAssignmentId
+```
+
+#### After
+```powershell
+$policyExemption = Get-AzPolicyAssignment -Name MyAssignment | New-AzPolicyExemption -Name MyExemption -ExemptionCategory Mitigated
+$policyAssignmentId = $policyExemption.PolicyAssignmentId
+```
+
+### `New-AzPolicySetDefinition`
+
+The `BackwardCompatible` parameter was previously introduced to preserve the legacy `.Properties`-based output shape. This parameter has now been removed. Cmdlets always return the modern flattened object shape, and legacy access via `.Properties.*` is no longer supported. Scripts must be updated to reference first‑class properties directly.
+
+#### Before
+```powershell
+$policyDefinitionReferences = ('[{ "policyDefinitionId": "' + (Get-AzPolicyDefinition -Name MyDefinition).ResourceId + '"}]')
+$policySetDefinition = New-AzPolicySetDefinition -Name MySetDefinition -PolicyDefinition $policyDefinitionReferences -BackwardCompatible
+$policyDefinitionReferenceId = $policySetDefinition.Properties.PolicyDefinitions[0].policyDefinitionReferenceId
+```
+
+#### After
+```powershell
+$policyDefinitionReferences = ('[{ "policyDefinitionId": "' + (Get-AzPolicyDefinition -Name MyDefinition).ResourceId + '"}]')
+$policySetDefinition = New-AzPolicySetDefinition -Name MySetDefinition -PolicyDefinition $policyDefinitionReferences
+$policyDefinitionReferenceId = $policySetDefinition.PolicyDefinition[0].policyDefinitionReferenceId
+```
+
+### `Remove-AzPolicyAssignment`
+
+The `BackwardCompatible` parameter was previously introduced to preserve the legacy behavior where `Remove-` cmdlets always returned a value. This parameter has now been removed. `Remove-` cmdlets will only return a value when `-PassThru` is specified.
+
+#### Before
+```powershell
+$result = Remove-AzPolicyAssignment -Name MyAssignment -BackwardCompatible
+```
+
+#### After
+```powershell
+$result = Remove-AzPolicyAssignment -Name MyAssignment -PassThru
+```
+
+### `Remove-AzPolicyDefinition`
+
+The `BackwardCompatible` parameter was previously introduced to preserve the legacy behavior where `Remove-` cmdlets always returned a value. This parameter has now been removed. `Remove-` cmdlets will only return a value when `-PassThru` is specified.
+
+#### Before
+```powershell
+$result = Remove-AzPolicyDefinition -Name MyDefinition -BackwardCompatible
+```
+
+#### After
+```powershell
+$result = Remove-AzPolicyDefinition -Name MyDefinition -PassThru
+```
+
+### `Remove-AzPolicyExemption`
+
+The `BackwardCompatible` parameter was previously introduced to preserve the legacy behavior where `Remove-` cmdlets always returned a value. This parameter has now been removed. `Remove-` cmdlets will only return a value when `-PassThru` is specified.
+
+#### Before
+```powershell
+$result = Remove-AzPolicyExemption -Name MyExemption -BackwardCompatible
+```
+
+#### After
+```powershell
+$result = Remove-AzPolicyExemption -Name MyExemption -PassThru
+```
+
+### `Remove-AzPolicySetDefinition`
+
+The `BackwardCompatible` parameter was previously introduced to preserve the legacy behavior where `Remove-` cmdlets always returned a value. This parameter has now been removed. `Remove-` cmdlets will only return a value when `-PassThru` is specified.
+
+#### Before
+```powershell
+$result = Remove-AzPolicySetDefinition -Name MySetDefinition -BackwardCompatible
+```
+
+#### After
+```powershell
+$result = Remove-AzPolicySetDefinition -Name MySetDefinition -PassThru
+```
+
+### `Update-AzPolicyAssignment`
+
+The `BackwardCompatible` parameter was previously introduced to preserve the legacy `.Properties`-based output shape. This parameter has now been removed. Cmdlets always return the modern flattened object shape, and legacy access via `.Properties.*` is no longer supported. Scripts must be updated to reference first‑class properties directly.
+
+#### Before
+```powershell
+$policyAssignment = Update-AzPolicyAssignment -Name MyAssignment -DisplayName 'My cool assignment' -BackwardCompatible
+$displayName = $policyAssignment.Properties.DisplayName
+```
+
+#### After
+```powershell
+$policyAssignment = Update-AzPolicyAssignment -Name MyAssignment -DisplayName 'My cool assignment'
+$displayName = $policyAssignment.DisplayName
+```
+
+### `Update-AzPolicyDefinition`
+
+The `BackwardCompatible` parameter was previously introduced to preserve the legacy `.Properties`-based output shape. This parameter has now been removed. Cmdlets always return the modern flattened object shape, and legacy access via `.Properties.*` is no longer supported. Scripts must be updated to reference first‑class properties directly.
+
+#### Before
+```powershell
+$policyDefinition = Update-AzPolicyDefinition -Name MyDefinition -Description 'A much better policy definition' -BackwardCompatible
+$description = $policyDefinition.Properties.Description
+```
+
+#### After
+```powershell
+$policyDefinition = Update-AzPolicyDefinition -Name MyDefinition -Description 'A much better policy definition'
+$description = $policyDefinition.Description
+```
+
+### `Update-AzPolicyExemption`
+
+The `BackwardCompatible` parameter was previously introduced to preserve the legacy `.Properties`-based output shape. This parameter has now been removed. Cmdlets always return the modern flattened object shape, and legacy access via `.Properties.*` is no longer supported. Scripts must be updated to reference first‑class properties directly.
+
+#### Before
+```powershell
+$policyExemption = Update-AzPolicyExemption -Name MyExemption -ExemptionCategory Waiver -BackwardCompatible
+$exemptionCategory = $policyExemption.Properties.ExemptionCategory
+```
+
+#### After
+```powershell
+$policyExemption = Update-AzPolicyExemption -Name MyExemption -ExemptionCategory Waiver
+$exemptionCategory = $policyExemption.ExemptionCategory
+```
+
+### `Update-AzPolicySetDefinition`
+
+The `BackwardCompatible` parameter was previously introduced to preserve the legacy `.Properties`-based output shape. This parameter has now been removed. Cmdlets always return the modern flattened object shape, and legacy access via `.Properties.*` is no longer supported. Scripts must be updated to reference first‑class properties directly.
+
+#### Before
+```powershell
+$policySetDefinition = Update-AzPolicySetDefinition -Name MySetDefinition -Metadata '{ "MyThing": "A really good thing" }' -BackwardCompatible
+$myThing = $policySetDefinition.Properties.Metadata.MyThing
+```
+
+#### After
+```powershell
+$policySetDefinition = Update-AzPolicySetDefinition -Name MySetDefinition -Metadata '{ "MyThing": "A really good thing" }'
+$myThing = $policySetDefinition.Metadata.MyThing
+```