We are a sizable company and we are currently on a task of renewal or purchase again a SAN (Subject Alternative Name) Digital certificate from Symantec. The previous year SAN cert has 5 domain/common name. Due to the business requirement this year we only need to register 4 domain/common name. We have the following queries:
1) Since the new SAN cert has less 1 common name and therefore Symantec mentioned that it is unavoidable but to re-apply a new cert ?
2) Since we need to go thru the CSR (Certification Signing Request) and Import cert on to our Server (Exchange Server ), is there any down time on an User perspective. i.e. Will the down time duration from the time we generate the CSR to the time will successfully import the cert. or is the down time only occurs during the time of e-cert installation ?