SAN E-CERT Renewal

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 ?
patricktamAsked:
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KashConnect With a Mentor 2nd Line EngineerCommented:
as far as I know if the existing certificate has expired then you are to generate a new request then like you said you will have to.

i would do it on a weekend may be friday evening and you will have 2 days to play around and make things work
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Kash2nd Line EngineerCommented:
As far as I can see there is/shouldn't be any downtime in regards to users. The only thing will be the users outlook/email program will have pop up about certificate expiry and that should be all.

hope this helps.
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patricktamAuthor Commented:
Thanks for your information. However, my concern is that since the new SAN cert has the original 4 domains out of 5 domains. The is not a renewal situation and we did need to regenerate the CSR, import cert process. Since 4 out of 5 domains name are exactly the same, do we need to remove the existing domain' certification before generating the CSR which means a very long downtime for the email client ?
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