[ExceptIf]FromAddressMatchesPatterns update

Issue #10611

Author: chrisda

exchange/exchange-ps/exchange/New-TransportRule.md

@@ -2050,6 +2050,8 @@ The ExceptIfFromAddressMatchesPatterns parameter specifies an exception that loo
 
 You can use SenderAddressLocation parameter to specify where to look for the sender's email address (message header, message envelope, or both).
 
+**Note**: Trying to search for empty From addresses using the value `""` for this parameter doesn't work.
+
 ```yaml
 Type: Pattern[]
 Parameter Sets: (All)
@@ -3106,6 +3108,8 @@ The FromAddressMatchesPatterns parameter specifies a condition that looks for te
 
 You can use SenderAddressLocation parameter to specify where to look for the sender's email address (message header, message envelope, or both).
 
+**Note**: Trying to search for empty From addresses using the value `""` for this parameter doesn't work.
+
 ```yaml
 Type: Pattern[]
 Parameter Sets: (All)

exchange/exchange-ps/exchange/Set-TransportRule.md

@@ -2029,6 +2029,8 @@ The ExceptIfFromAddressMatchesPatterns parameter specifies an exception that loo
 
 You can use SenderAddressLocation parameter to specify where to look for the sender's email address (message header, message envelope, or both).
 
+**Note**: Trying to search for empty From addresses using the value `""` for this parameter doesn't work.
+
 ```yaml
 Type: Pattern[]
 Parameter Sets: (All)
@@ -3085,6 +3087,8 @@ The FromAddressMatchesPatterns parameter specifies a condition that looks for te
 
 You can use SenderAddressLocation parameter to specify where to look for the sender's email address (message header, message envelope, or both).
 
+**Note**: Trying to search for empty From addresses using the value `""` for this parameter doesn't work.
+
 ```yaml
 Type: Pattern[]
 Parameter Sets: (All)