Merge pull request MicrosoftDocs#2698 from MicrosoftDocs/chrisda-patch-1

Update Get-MessageTrace.md

Author: chrisda

exchange/exchange-ps/exchange/mail-flow/Get-MessageTrace.md

@@ -92,7 +92,7 @@ Accept wildcard characters: False
 ```
 
 ### -MessageId
-The MessageId parameter filters the results by the Message-ID header field of the message. This value is also known as the Client ID. The format of the Message-ID depends on the messaging server that sent the message. The value should be unique for each message. However, not all messaging servers create values for the Message-ID in the same way. Be sure to include the full Message ID string. This may include angle brackets.
+The MessageId parameter filters the results by the Message-ID header field of the message. This value is also known as the Client ID. The format of the Message-ID depends on the messaging server that sent the message. The value should be unique for each message. However, not all messaging servers create values for the Message-ID in the same way. Be sure to include the full Message ID string (which may include angle brackets) and enclose the value in quotation marks (for example, "<d9683b4c-127b-413a-ae2e-fa7dfb32c69d@DM3NAM06BG401.Eop-nam06.prod.protection.outlook.com>").
 
 ```yaml
 Type: MultiValuedProperty