Do I need an on-prem SSL Cert after migrating to Office 365?

We've migrated to office 365 and my old SSL Certs (from our on-prem Exchange server) are expiring. Do i need an SSL Cert for Office 365? Part of the reason i ask is because we're getting "A secure connection cannot be established with the server xxx.office365.com on our Apple Macs.
ronfastI.T. DirectorAsked:
Who is Participating?
I wear a lot of hats...

"The solutions and answers provided on Experts Exchange have been extremely helpful to me over the last few years. I wear a lot of hats - Developer, Database Administrator, Help Desk, etc., so I know a lot of things but not a lot about one thing. Experts Exchange gives me answers from people who do know a lot about one thing, in a easy to use platform." -Todd S.

Jose Gabriel Ortega CEE Solution Guide - CEO Faru Bonon ITCommented:
Hi ronfast.

It depends on the current state of your platform.

For example, you mentioned that you have migrated to O365, but you didn't specify what was the method (cutover or hybrid) and that's important for your answer. So...

If you  did a cutover migration, the answer is NO, you don't need an SSL for an O365 Tenant that is just on the CLOUD
If you did a hybrid migration, and you haven't still decommissioned the On-prem Exchange Servers, of course, you do need a certificate to maintain your HYBRID infrastructure since O365 and your On-prem are sharing a common system.

Hope it's clear my answer.

Now, once you migrated your accounts from On-prem to O365, it's required that you re-create the profile on the outlook. Since they aren't anymore on the On-prem and the GUID is different on the Cloud, so it should be fixed by re-creating the profiles.
1

Experts Exchange Solution brought to you by

Your issues matter to us.

Facing a tech roadblock? Get the help and guidance you need from experienced professionals who care. Ask your question anytime, anywhere, with no hassle.

Start your 7-day free trial
ronfastI.T. DirectorAuthor Commented:
Okay, it was a cutover. that answered my question. thanks.
0
Jose Gabriel Ortega CEE Solution Guide - CEO Faru Bonon ITCommented:
Np. Your welcome! glad to help
0
It's more than this solution.Get answers and train to solve all your tech problems - anytime, anywhere.Try it for free Edge Out The Competitionfor your dream job with proven skills and certifications.Get started today Stand Outas the employee with proven skills.Start learning today for free Move Your Career Forwardwith certification training in the latest technologies.Start your trial today
Microsoft Office

From novice to tech pro — start learning today.