Update Set-ExternalInOutlook.md

30 to 50 per email request

Author: chrisda

exchange/exchange-ps/exchange/Set-ExternalInOutlook.md

@@ -84,7 +84,7 @@ To add or remove one or more values without affecting any existing entries, use
 
 This parameter is meaningful only when the value of the Enabled parameter is $true.
 
-The maximum number of entries is 30, and the total size of all entries can't exceed one kilobyte.
+The maximum number of entries is 50, and the total size of all entries can't exceed one kilobyte.
 
 ```yaml
 Type: MultiValuedProperty