Merge pull request MicrosoftDocs#7717 from Batre-MSFT/patch-7

Updated PollInterval parameter

Author: chrisda

exchange/exchange-ps/exchange/Set-OabVirtualDirectory.md

@@ -242,6 +242,8 @@ Accept wildcard characters: False
 ```
 
 ### -PollInterval
+This parameter is available or functional only in Exchange 2010.
+
 The PollInterval parameter specifies the time interval in minutes that the distribution service should poll the offline address book generation server for updates.
 
 ```yaml