I could login but, before posting a comment or sending a pm, the forums asked to send me a confirmation letter to the email I've been using since 2006 and it never showed.
Got back on the forms somehow.
My attempts included:
The Skype help desk ended up getting me to one person who was no longer taking part and no other answers.
Left a message in a Google group for BOINC that had D Anderson was a part of.
Asked people I knew in other project forums to ask for help for me here.
Sent D Anderson emails via the Berkley email system.

Not sure how the issue got resolved.
Thankyou to whoever helped.

I still wonder, will this happen again if I do not post to this forum for a year (or some number of months) and will a confirmation message be successfully sent to my email in the future?

I'd say, check in Your Account that the email address you provided is correct and check in the email that it didn't end up in the spam folder. You shouldn't need a new confirmation, unless you log in with a new account.

Edit: the change with the past is that this time a valid email address is required, where before you could fill in anything you liked.