exchange , certificates

I have assigned new  ssl cert installed on our exchange, for some reason windows 10 tablets are having issues.

we want old cert to be extended , it has been issued by our internal CA.
 CAN we EXTEND IT for one year ? with private key

also if we extend it and some thing goes wrong , can we reuse the old cert back again if we take a back up which we are extending having original dates. or cert itself will change and cant reuse the old one

for ex.

if we extend  the current cert1 having expiry in dec 2016 to dec 2017 and something goes wrong

can we resue the old cert having expiry  which was till dec 2016
pramod1Asked:
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Erik D'antoniConnect With a Mentor Senior Systems EngineerCommented:
Option C essentially keeps everything the same
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Erik D'antoniSenior Systems EngineerCommented:
What is the problem with the new certificate? Error message, exchange environment, etc.
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pramod1Author Commented:
windows 10 tablets are having cert issues and their mail app doesn't work , no incoming or send in d emails, all other laptops works fine, the new cert has everything as old cert can you remote and have a look if possible
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pramod1Author Commented:
I need to renew my existing cert

A)      Renew certificate with new key
B)      Request new cert with same key
C)      Renew this cert with same key

i am kind of confused between option A and option B
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Erik D'antoniSenior Systems EngineerCommented:
Option A renew's the existing certificate but creates a new key. Option B get's you a new certificate with the same key and Option C renew's the cert with the same key.

I thought you already installed the new certificate? What is the error message? What version of exchange are you on. Need this information in order to help.
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pramod1Author Commented:
when I install the cert, everything works except mail app on windows 10 client which gives error

0x80072f89, so I was deciding to renew exiting cert
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pramod1Author Commented:
Option A renew's the existing certificate but creates a new key. Option B get's you a new certificate with the same key and Option C renew's the cert with the same key.

so which is the best option

is there any difference between option A and option c
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