"Cannot sign in to Lync. There was a problem acquiring a personal certificate required to sign in".
Of course I tried all of the typical stuff - restarting Lync, rebooting the laptop but it didn't help. No other users were reporting this issue - they could all sign in just fine - so I'm assuming it's something local to my Windows 7 64 bit laptop.
I did some research and it looks like something was corrupt with my local cached credentials. Not sure why - i didn't change my password or anything like that. I found this article from Microsoft...
Here are the steps from that article that worked for me...
To renew a user account certificate, follow these steps:
- Renew the certificate in Windows Certificate Manager. To do this, follow these steps:
- Open Windows Certificate Manager. To do this, click Start, click Run, type certmgr.msc, and then click OK.
- Expand Personal, and then expand Certificates.
- Sort by the Issued By column, and then look for a certificate that is issued by Communications Server.
- Verify that the certificate is present and that it is not expired.
- Delete the certificate and try to sign in to Lync Online. If you cannot sign in to Lync Online, go to step 2.
- If you are running Windows 7, remove the user’s stored credentials in Windows Credential Manager. To do this, follow these steps:
- Click Start, click Control Panel, and then click Credential Manager.
- Locate the set of credentials that is used to connect to Lync Online.
- Expand the set of credentials, and then select Remove from Vault.
- Try to sign in to Lync Online again, and then type your new set of credentials.