I've had an SBS 2003 server running now for 6 years and just recently (couple weeks ago) I started getting the following alerts a few times a week:
The lsass.exe process is allocating more memory than usual.
Use Task Manager to view the top processes by CPU or memory usage. If a service or process appears to be using an unusual amount of resources, try stopping and then restarting it.
You can disable this alert or change its threshold by using the Change Alert Notifications task in the Server Management Monitoring and Reporting taskpad.
I've read some other postings on EE that I can avoid these alerts by changing my alert settings. However, I would like to know (if it's possible) as to why I've started to receive these alerts now when for the past 5+ years I never saw one of these alerts.
I have not installed any new software or applications nor hardware. Aside from Microsoft updates, the server is pretty much identical to day one install.
If there is any other info I can provide please ask, screen shots, etc.