We help IT Professionals succeed at work.
Get Started

Office 365:  Hybrid without everyone DirSync

1 Endorsement
Last Modified: 2017-05-16
For an acquisition strategy we may have a tenant were 100 mailboxes will be in the cloud and 1500 will be on-premises.

Normally this is no big deal, right?  

But in this case we only plan to DirSync (AD Connect) the 100 AD Users with the mailboxes in the cloud.

Inbound mail will hit on-premises and that should work fine.

My question involves what we will have to do to get internal email to travel from the cloud mailboxes to the on-premises mailboxes?  Will that require conditional based routing with a transport rule or will the hybrid created connectors be enough... or must we sync all AD Users with a mailbox.

Note: we do not require a unified GAL

Thank you.
Watch Question
Most Valuable Expert 2015
Distinguished Expert 2020
This problem has been solved!
Unlock 1 Answer and 5 Comments.
See Answer
Why Experts Exchange?

Experts Exchange always has the answer, or at the least points me in the correct direction! It is like having another employee that is extremely experienced.

Jim Murphy
Programmer at Smart IT Solutions

When asked, what has been your best career decision?

Deciding to stick with EE.

Mohamed Asif
Technical Department Head

Being involved with EE helped me to grow personally and professionally.

Carl Webster
CTP, Sr Infrastructure Consultant
Ask ANY Question

Connect with Certified Experts to gain insight and support on specific technology challenges including:

  • Troubleshooting
  • Research
  • Professional Opinions
Did You Know?

We've partnered with two important charities to provide clean water and computer science education to those who need it most. READ MORE