If your account's email address is no longer valid
If you have run BOINC under the account,
you can access the account
even if you don't know the password and the email
address is no longer valid. Here's how:
Go to the BOINC directory on your computer
(on Windows this is usually C:\Program Files\BOINC.
Find your account file for this project;
this will have a name like account_lhcathome.cern.ch.xml
(where the project URL is http://lhcathome.cern.ch).
Open the file in a text editor like Notepad.
You'll see something like