Update Set-Mailbox.md

Author: dariomws

exchange/exchange-ps/exchange/mailboxes/Set-Mailbox.md

@@ -2371,6 +2371,8 @@ To specify the primary SMTP email address, you can use any of the following meth
 
 - Use the PrimarySmtpAddress parameter instead. You can't use the EmailAddresses parameter and the PrimarySmtpAddress parameter in the same command.
 
+The PrimarySmtpAddress parameter updates the primary email address and WindowsEmailAddress property to the same value.
+
 To replace all existing proxy email addresses with the values you specify, use the following syntax: "\<Type\>:\<emailaddress1\>","\<Type\>:\<emailaddress2\>",..."\<Type\>:\<emailaddressN\>".
 
 To add or remove specify proxy addresses without affecting other existing values, use the following syntax: @{Add="\<Type\>:\<emailaddress1\>","\<Type\>:\<emailaddress2\>",...; Remove="\<Type\>:\<emailaddress2\>","\<Type\>:\<emailaddress2\>",...}.
@@ -3905,6 +3907,8 @@ The PrimarySmtpAddress parameter specifies the primary return email address that
 
 If you set the EmailAddressPolicyEnabled parameter to $false, you can specify the primary address using the PrimarySmtpAddress parameter, but that means the email addresses of the mail user no longer automatically updated by email address policies.
 
+The PrimarySmtpAddress parameter updates the primary email address and WindowsEmailAddress property to the same value.
+
 ```yaml
 Type: SmtpAddress
 Parameter Sets: Identity