Upgrade root .CA from SHA1

I would like to upgrade our root  CA from SHA1 to SHA256.
I would appreciate if any help on this

In particular, what would happen the existing issued certificates for computers. Server's and service accounts? Is it not disruptive upgrades?
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Abhi PappiTechnical Lead - Network SupportCommented:

Please refer to the steps advised in the below articles.



Hope that helps.

nothing happens to existing certificates, it will continue as IS until expiration

Follow steps in below TechNet wiki article, very clear

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sara2000Author Commented:
So the SHA2 will not be effective until we  PCs get new certificate? Is there anyway we can renew the PC's cert after SHA256 instead  of waiting for the renewal period?
SHA2 will not be effective until your CA certificate is renewed with SHA256 bit key
Once you renewed CA cert with new algorithm, your clients can get certs with 256 bit key algorithm
However clients will not trigger autoenrollment again before their renewal period starts
U could revoke currently issued certs from CA console so that client will try to renroll new cert - test it 1st
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