With the NetScaler changes to send all traffic to Drupal by default I have seen a number of 404 errors in the logs which have nothing to do with Drupal.
Microsoft Outlook, when configured in an Enterprise setting with Microsoft Exchange or Outlook 365 (Exchange in the Cloud) uses a series of different methods to attempt to configure the users email settings automatically from Exchange.
One of the Auto Discover methods employed by Outlook is,
With the NetScaler changes to send all traffic to Drupal by default I have seen a number of 404 errors in the logs which have nothing to do with Drupal.
Why does my site receive lots of requests to autodiscover.xml?
Microsoft Outlook, when configured in an Enterprise setting with Microsoft Exchange or Outlook 365 (Exchange in the Cloud) uses a series of different methods to attempt to configure the users email settings automatically from Exchange.
One of the Auto Discover methods employed by Outlook is,
Acquia recommends handling this kind of traffic in one of the ways recommended in our related article "Avoiding 404 error messages in your logs"