Here are some links following-up on questions I receive almost daily about what can and cannot be managed from on premise once the last Exchange server (i.e. Exchange Hybrid) is removed and directory sync is maintained. I was unable to find a comprehensive list but the info can be extrapolated from each.
- Hybrid deployment best practices
- Decommissioning your Exchange 2010 servers in a Hybrid Deployment
- Office 365 Identity Management with DirSync without Exchange Server On-Premises
- Prepare to provision users through directory synchronization to Office 365
- Owners of an on-premises distribution group that’s synced to Office 365 can’t manage the distribution group in Exchange Online
- Office 365 with mailboxes and dirsync without Exchange on-premises
- Best practices for managing Office 365 from Active Directory
- Managing Office 365 e-mail addresses easy with PowerShell when using DirSync
- TEN good reasons to keep a Hybrid Exchange Server
- Understanding Hybrid Servers in Exchange 2010 Hybrid Deployments
- Office 365 and Dirsync: Why should you have at least one Exchange Server on-premises
- Office 365 – Decommissioning on Premises Exchange
In most every case, if there is an existing on premise Exchange environment, I strongly recommend maintaining it when configured for hybrid with Office 365 specifically for SMTP relay needs if appliances and applications are still sending notifications (no need to replace the existing one for IIS), and management of email-based attributes from in a single location rather than in two locations.
These three articles (added 15 Dec 2015) have convinced me there is no easy way to say it other than you’ll need an on premise Exchange server for now if you want to maintain Microsoft integrated sign in options with O365.
- Mailbox Management & SSO after Office 365 Hybrid Migration
- Office 365 and Dirsync: Why should you have at least one Exchange Server (Hybrid) on-premises
- How and when to decommission your on-premises Exchange servers in a hybrid deployment
Lastly, this video from Ignite (beginning at 1.08.06) gives a concise explanation of the options and consequences of removing all on premise Exchange servers. The image below is a slide from that session.
Anyway, the decision is up to you, so please, educate yourself before making a final decision.
Good luck and have fun!
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Updated on 16 March 2016