While investigating a stability issue on a customer's CRM 3.0 Server recently, I figured I needed to identify what the calls to notification.asmx were. These calls are made every 30 seconds, and can be identified in the IIS logs as follows:
2008-09-08 11:11:44 192.168.2.107 POST /MSCRMServices/notification.asmx
Each call results in a SQL query to the MSCRM database, like the following:
exec sp_executesql N'Select EventId, EventData, CreatedOn From Notification Where CreatedOn > @CreatedOn', mailto:N datetime', @CreatedOn = 'Aug 14 2008 3:08:02:370PM'
A reasonably detailed check on the internet suggested nobody else knew what notification.asmx was doing, or if they did, they weren't telling.
I won't bore you with the details of how I found it, other than my past experience with CRM 1.2 helped, but in case you're interested, it's used for processing CRM 1.2-style callouts. Unfortunately this had noting to do with the ultimate problem, but at least I now know to eliminate it from my enquiries.