Merge pull request MicrosoftDocs#6414 from dariomws/patch-209

Added sentence about DL to Start-HistoricalSearch.md

Author: chrisda

exchange/exchange-ps/exchange/Start-HistoricalSearch.md

@@ -41,6 +41,8 @@ Start-HistoricalSearch -EndDate <DateTime> -ReportTitle <String> -ReportType <Hi
 ## DESCRIPTION
 A historical search provides message trace and report details in a comma-separated value (CSV) file for messages that are aged between 1-4 hours (depending on your environment) and 90 days old. There is a limit of 250 historical searches that you can submit in a 24 hour period; you'll be warned if you're nearing the daily quota. Cancelled searches count against the daily quota. Also, in each CSV file there is a limit of 50000 results or lines.
 
+If you specify a distribution group, all messages might not be returned in the results. To ensure that all messages are returned, specify the individual recipient.
+
 You need to be assigned permissions before you can run this cmdlet. Although this topic lists all parameters for the cmdlet, you may not have access to some parameters if they're not included in the permissions assigned to you. To find the permissions required to run any cmdlet or parameter in your organization, see [Find the permissions required to run any Exchange cmdlet](https://docs.microsoft.com/powershell/exchange/find-exchange-cmdlet-permissions).
 
 ## EXAMPLES