Here is a link at IRS web site that mentions the 180-day password change requirement. I don't recall ever seeing a pub on this specific topic (eservices registration and maintenance). The tutorials at the eservices site have some info as well. I believe the whole registration & password management process were revised at the same time as DA and EAR were removed from eservices.
http://www.irs.gov/pub/irs-utl/eservice ... rocess.pdf[edit] Here's a more authoritative link, see section 3.42.8.5.4 and following:
http://www.irs.gov/irm/part3/irm_03-042-008.htmlI have been registered with eservices since 2008 or so, don't remember whether I ever received an email reminder. But I have a simple calendar reminder to myself to log in once a month, just to keep an eye on things and make sure my access hasn't been compromised. I don't grab that many transcripts online, especially during tax season.