Removed time range

Responding to PR comments to let user define time range when running. Have added comment to description to prompt user on this.

Functions/OfficeMailForwardingParser.txt

@@ -18,10 +18,10 @@
 // Usage Instruction : 
 // Either run this parser as a stand alone query within Azure Sentinel or save it as a KQL function for later use. Further details on
 // functions can be found here: https://techcommunity.microsoft.com/t5/Azure-Sentinel/Using-KQL-functions-to-speed-up-analysis-in-Azure-Sentinel/ba-p/712381
+// If running as a stand alone qeury consider adding customised time range to the query at run time.
 //
 //
 OfficeActivity
-    | where TimeGenerated >= ago(30d)
     | where Operation == 'New-InboxRule'
     | extend details = parse_json(Parameters)
     | where details contains 'ForwardTo' or details contains 'RedirectTo'