First, you must preserve the existing conditions. Assign each existing condition in the condition array to its own variable. Use the following command syntax to assign the condition array to a variable:

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$ConditionArray = (Get-TransportRule "<rule name>").Conditions

To assign the conditions of a transport rule to a variable and view how many conditions are in the array

Then assign each condition in the array to its own variable. The conditions are in array elements, which are numbered 0 through $Condition.Length - 1. Use the following syntax to assign each condition array element to its own variable:

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$ExistingCondition<Array Element Number> = $ConditionArray[<Array Element Number>]

To assign each condition array element to its own variable

Then create the new condition or conditions. You can't use conditions that are already applied to the existing transport rule. Use the following syntax to assign a new condition to a variable:

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$NewCondition = Get-TransportRulePredicate <Predicate Name>

For a list of transport rule predicates, see Transport Rule Predicates.

To assign a new condition to a new variable

After you assign the new condition to a new variable, assign values to the condition. Use the following command to assign values to the new condition:

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$NewCondition.<PredicateProperty> = <Single Value or Array of Values>

For a list of transport rule predicate properties and the expected formatting of their values, see Transport Rule Predicates.

To assign values to a new condition

After you create all the new conditions, apply all the conditions to the existing transport rule. Use the following command syntax to modify the transport rule:

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Set-TransportRule <Transport Rule Name> -Condition @(<Conditions>)

Note:
You must order the existing and new conditions according to their Rank when you specify them in the Set-TransportRule command. Use the Get-TransportRulePredicate command to view the rank of each condition or exception.

To modify the existing transport rule

To remove a condition from a transport rule, follow these steps from the section earlier in this topic:

1. Assign the conditions of a transport rule to a variable and view how many conditions are in the array.
   
   
2. Assign each condition array element to its own variable, except the condition that you want to remove.
   
   
3. Modify the existing transport rule.
   
   

To remove a condition from a transport rule

First, assign the conditions of the existing transport rule to a variable and view the array. Use the following command syntax:

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$ConditionArray = (Get-TransportRule "Test Rule").Conditions

To assign the conditions of a transport rule to a variable and view how many conditions are in the array

Determine which condition you want to modify and note its array element number. See "Adding Values to an Existing Multiple-Value Condition" later in this topic to find the correct array element number.

After you determine the array element number, assign the new value to that condition by using the following command syntax:

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$ConditionArray[<array element number>].<Predicate Property> = <Single Value>

To assign a value to the WithImportance condition at array element number 2

To modify the existing transport rule

• Run the following command:

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  Set-TransportRule "Test Rule" -Condition $ConditionArray

Note:
You don't have to insert the $ConditionArray variable in an array because $ConditionArray variable is already an array.

First, you must assign the conditions of the existing transport rule to a variable and view the array. Use the following command syntax:

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$ConditionArray = (Get-TransportRule "Test Rule").Conditions

To assign the conditions of a transport rule to a variable and view how many conditions are in the array

Determine which condition you want to modify and note its array element number. The first condition in the array is at array element 0. If the condition that you want to modify is the third condition in the list, its array element number is 2. You must then determine the predicate property or properties of the condition. The condition's predicate properties are always listed immediately before the line starting with LinkedDisplayTextException, as in the following example:

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Addresses : {Kim Akers} LinkedDisplayTextException : except if from <a id="Addresses">people</a> Name : From Rank : 0 LinkedDisplayText : from <a id="Addresses">people</a> Words : {Corporate Communication, Message from VP, Sales Quotas} LinkedDisplayTextException : except if with <a id="Words">specific words</a> in the subject Name : SubjectContains Rank : 15 LinkedDisplayText : with <a id="Words">specific words</a> in the subject

In this example, the first condition, at array element 0, has the predicate property Addresses. The second condition, at array element 1, has the predicate property Words.

To add new values to an existing condition, use the following command syntax:

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$ConditionArray[<Array Element Number>].<Predicate Property> += <Array of Values>

For a list of transport rule predicate properties and the expected formatting of their values, see Transport Rule Predicates.

To add values to an existing condition at array element 1 of the example

To modify the existing transport rule

• Run the following command:

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  Set-TransportRule "Test Rule" -Condition $ConditionArray

Note:
You don't have to insert the $ConditionArray variable in an array because $ConditionArray variable is already an array.

To remove values from an existing condition, you must note the existing values and then re-enter the existing values into the condition, omitting the values that you no longer want. When you perform the following procedure, the existing values are replaced with the values that you specify.

Note:
The following procedure works well for conditions that have only a few values configured. However, for conditions that have dozens, or hundreds, of values configured, this procedure is not feasible. We recommend that you use a foreach loop when it is unreasonable to manually reassign values to a condition. For more information, see Using the Exchange Management Shell.

First, you must assign the conditions of the existing transport rule to a variable and view the array. Use the following command syntax:

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$ConditionArray = (Get-TransportRule "Test Rule").Conditions

To assign the conditions of a transport rule to a variable and view how many conditions are in the array

Then view the values of the condition that you want to modify and replace the values of that condition with the values that you want to keep. For more information about how to determine the element number and predicate properties of a condition array, see "Adding Values to an Existing Multiple-Value Condition" earlier in this topic. Use the following command syntax:

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$ConditionArray[<Array Element Number>]

Then replace the existing values of the condition that you want to modify with the values that you want to keep. Use the following command syntax:

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$ConditionArray[<Array Element Number>].<Predicate Property> = <Array of Values>

For a list of transport rule predicate properties and the expected formatting of their values, see Transport Rule Predicates.

To remove values from an existing condition at array element 1 of the earlier example

To modify the existing transport rule

• Run the following command:

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  Set-TransportRule "Test Rule" -Condition $ConditionArray

Note:
You don't have to insert the $ConditionArray variable in an array because the $ConditionArray variable is already an array.