is it required two auto discover record for exchange 2010 hybrid setup..??

We have a  exchange 2010 Server  .we plan to configure Exchange Hybrid Setup for top most mail users high availability .that is for  to move some critical mail users to office 365 exchange online

we all ready have a autodiscover A record for on premise Exchange server eg:- autodiscover.domain .com .is  required to configure another CNAME record ie.  "" when adding the custom domain on  office 365  like below

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Vasil Michev (MVP)Commented:
No, this record needs to be configured when you move over to Exchange Online and you no longer have any mailboxes on-prem. For Hybrid, Autodiscover should point to your local server.
harisaboobakerAuthor Commented:
we are plan to configure all users  mail flow through office 365 .(MX pointed to office 365)

on premises users mail client connectivity through on premise server (outlook anyware  for remote users ) and office 365 mail clients  through office 365 . in this type scenario is required two autodiscover records..???
harisaboobakerAuthor Commented:
our major consideration for moving  to office 365 , critical mail users  high availability  .

if on premises server is down we can continue to access mail from  office 365 for critical mail users
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harisaboobakerAuthor Commented:
we  already  have a Autodiscover A record for on premises Exchange 2010 Sp3 Server ( .How to add a CNAME Record for
David Johnson, CD, MVPOwnerCommented:
you can't have 2 records and a cname as the results of a dns lookup will be unpredictable.
a autodiscover
CNAME Autodiscover
harisaboobakerAuthor Commented:
how to configure office 365 mail account in outlook and active sync on mobile devices  using autodiscover service  (only putting the email address and password )

 Or can we configure manually on outlook and mobile
Don't point autodiscover to O365 in Hybrid Exchange scenario
Just keep it AS IS - onpremise
Your hybrid setup co-existence can't work with autodiscover pointing to O365
As suggested earlier by others, complete all mailbox movement in cloud and then switch autodiscover
You may switch MX if wanted to

The concept you are exploring works well for migrating email platforms other than Exchange to O365

Also if you want to authenticate O365 users with email and password only, configure directory sync with default option, Objectguid with userprincipalname under user matching
Make sure that users UPN ( should match their primary smtp address
Now Use Dirsync password sync feature OR you can use Adfs to get SSO

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harisaboobakerAuthor Commented:
Thanks All....
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