When trying to publish an update of a click once application today, I found that the certificate we have been using since I started this job, had expired since the last publish. It appears that it was created through the signing tab in visual studio by clicking the "Select From Store" button. Here is the information I see for the old key:

I was able to use RenewCertconsole app (from the link above)to create a new certificate using the same key. I first modified the RenewCert code to make the certificate expire in 99 years instead of 5 so that no one here will have to deal with the problem again.Ithen selected my new certificate fileas the manifest certificate (which added it to my certificate store automatically) and added the file to thevisual studio project. It was available to the other developers through source safe so I didn't have to do anything else for them to use it.Thanks for my help!

I have found these articles stating that if it is a self issued certificate it can be renewed using this microsoft hack utility:

http://support.microsoft.com/?kbid=925521

Here is a similar forum topic with some good discussion on the problem:

http://forums.microsoft.com/MSDN/ShowPost.aspx?PostID=442030&SiteID=1

My other question still stands. If I successfully renew our certificate, how do I make it available to the other developers so that any of us can publish?

I was able to use RenewCertconsole app (from the link above)to create a new certificate using the same key. I first modified the RenewCert code to make the certificate expire in 99 years instead of 5 so that no one here will have to deal with the problem again.Ithen selected my new certificate fileas the manifest certificate (which added it to my certificate store automatically) and added the file to thevisual studio project. It was available to the other developers through source safe so I didn't have to do anything else for them to use it.Thanks for my help!