I hope this is the right forum to ask this design question. We are currently running Exchange 2007 and looking to migrate to Exchange 2013 in a hybrid approach so we can also leverage Office 365 for some mailboxes.
In the near future we want to setup some type of new email and sharepoint infrastructure for our partners (600+ users) to use and of course single sign on for all other services that we may provide. There's nothing in place for them as of now.
Internally, we are a single forest 2008R2 mode (2012 in the near future), with multiple child domains.
Should we setup another child domain for the partner accounts or should we setup a totally separate forest. ADFS?
Ideally, we would like to put all the partner mailboxes/sharepoint access in O365 but have a single pane of glass to manage both partner mailboxes/sharepoint and our corporate users that we decide to migrate to O365.
Are there any design guides, case studies out there from MS that kind of touches base on what I'm asking. Thanks for any feedback.
Dan