Hi,

We have moved most of our users to Office365 and decomissioned our old Exchange 2007 system, however, the company wishes to have a small Exchange server in house for some other business email. Using an IIS relay has caused issues due to the load on it.

As our users are in Office365 and have proxy addresses for mail.onmicrosoft.com in their AD attributes and as I am not totally familar with Exchange, my question is:

Will installing Exchange 2013 again here in our company AD environment have any knock on affect on these proxy addresses or break anything for the users currently using Office365?

Cheers

Hi Andy,

I was somehow under the impression that I needed the whole thing in order to provide an SMTP relay etc outbound.  I guess not!

Thanks for that, makes my job way easier.

M

Hi,

Since you decommission old Exchange 2007, every Exchange attribution has been cleared in AD.

We need re-install Exchange server in On-premises AD, we might can recover a lost server by using the Setup /m:RecoverServer switch in Microsoft Exchange Server 2013. Then re-configure Hybrid environment Exchange 2013 with Office 365. For your reference: https://technet.microsoft.com/en-us/library/jj200581%28v=exchg.150%29.aspx

Thanks