Challenging Task - Two Domains - Two Office 365 Service

Hi All,
We have a challenging task ahead of us at my small company and we are trying to figure out the best way to do things.
A quick summary of the situatoin
We are ABC.COM and we sit in XYZ.COM's building with their own infrastructure.  We log into their domain, etc.
We currently use abc.com's Office 365 Services with just a different smtp address set per account.
5 out of the 20 people who work for ABC.COM use XYZ.COM as their primary SMTP address. (this is required for business purposes since it is our parent company and they leverage their powerful name).
We are isolating ABC.COM and building a whole new virtual/cloud infrastructure and signing up for their own Office 365 Service.
Our Challenge:
5 of the 20 still need to send and receive as XYZ.COM but we want them to log into our newly created Domain / Virtual Environment and also still access XYZ.COM's Intranet Site (for benefits, forms, since its our parent company).
How would we go about doing this cleanly?
We have some general ideas but we've been thinking of situations that may cause problems like Account Lockouts for those 5 individuals or passwords expiring on XYZ.COM (there is no way we can set ourselves to never expire).
I really hope this is clear and we're just looking to do this correctly.
Now, we have different opinions on how this should be done but I'm curious if anyone has come across this before and what they have done successfully.  We can't afford to do this and then find major issues down the line.  
Thanks,
Patrick

just give them OWA access or create a trust between two org.,
Where Technology Meets Talent

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