Load balancer appliance design and consideration when using Office 365 ?

Quick question people,

When I'm still using OnPremise Exchange 2010, I'm using Riverbed SteelApp load balancer to load balance the CAS/HT Exchange Server role.

But in this case, as soon as I migrate all of the mailboxes to the Office 365, do I need to change anything on the Load Balancer or Internal DNS server to something else ?
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Senior IT System EngineerIT ProfessionalAsked:
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David Johnson, CD, MVPOwnerCommented:
When I'm still using OnPremise Exchange 2010, I'm using Riverbed SteelApp load balancer to load balance the CAS/HT Exchange Server role.
After the migration is complete you don't need the load balancer

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Adam BrownSr Solutions ArchitectCommented:
If you intend to keep your on-prem servers for management of on-prem user accounts or as a way to provide anonymous relay to Office 365, you can keep the existing load balance configuration. However, neither of these uses really justifies load balancing. If you have other applications that need High Availability, the Load Balancer would be better served providing service to those applications than Exchange for these purposes.

If you are keeping your mail flow going through your on-prem servers for compliance or other reasons, definitely keep your load balancer in place, but you won't need to make changes to how it's configured for any purpose.

That said, one of the big advantages to O365 is that it provides High Availability without the need to configure or pay for HA equipment and licenses. Exchange online is designed to be very fault tolerant, with at least 3 copies of each Exchange database loaded on separate servers. Load balancing capability is built into the solution, so you don't need to make any configuration changes. Also note that your load balancer can't be configured to improve O365 services, simply because you don't have the necessary control of O365 to create a configuration that would load balance O365. And since MS has load balancers in their datacenters, adding your own load balancing solution will do nothing.
Senior IT System EngineerIT ProfessionalAuthor Commented:
Many thanks all for the reply,

So yes some of my applications still needs to send out monitoring email regularly so I guess I still need to keep the load balancer for that reason.

No I do not want to keep any of exchange servers 2010 at all because I need to reclaim the disk space used.
Adam BrownSr Solutions ArchitectCommented:
If your applications need to send mail, you won't need load balancing specifically for that. The question is whether they support authenticated SMTP session. If they don't give you the option of entering a username and password for email, then you will need an on-premises Email server to allow Anonymous Relaying. This is best managed with an On-Prem Exchange server, since IIS SMTP is pretty much garbage (It's usable for doing anonymous relaying to O365, but it is buggy, crashy, and difficult to troubleshoot mail flow issues). If all your applications allow you to enter a username and password for sending emails, you can just point them to O365, since that is supported with O365 (Anonymous Relay is not allowed against Exchange Online's mail servers)
Senior IT System EngineerIT ProfessionalAuthor Commented:
Thanks !
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