We are going to need to start supporting multiple subdomains soon (de. fr. etc) so will need to change to a wildcard certificate. This is also good timing with the heartbleed bug.
To change to a wildcard cert I will need to create a new CSR, then when I use this new certificate I am worried that users will be shown warnings in there browsers.
Is there a way to avoid this or have I misunderstood the problem?