Do links in old emails expire?

[Anonymous]

We recently discovered that a few of our older emails (sent in August/september) have links that no longer work. They all lead to 404 pages. The links go to our blog, and the pages have not moved or changed urls - so there should not be an issue. 
If I re-send a sample to myself, the links work fine, just not in the original emails.

Do email links expire after a certain length of time? 
Thanks for any help!

[Anonymous]

Ah-ha! Thanks, Will. I forgot that that was going to happen.

[Anonymous · Accepted solution]

Hi Chris,
Back in the September release, Marketo changed the URLs in emails to be shorter. We notified everyone that the old, longer, links will expire 90 days after the release. I believe we just passed the 90 day mark and that is why your links are no longer working.

More info here: https://community.marketo.com/MarketoArticle?id=kA050000000LBSsCAO#shorter-urls

Will