Office 365 migration - No onsite Exchange and only .local domain in AD

Good evening hive mind

Ok here's my environment

onsite email - non exchange, non AD integrated solution
UPN's are all like Jon-Doe@contoso.local  with pre-windows 2000 they are contoso\Jon-Doe
email addresses are like joe.doe@contoso.com or joe@contoso.com across multiple domains
all client machines are Win 7 with 2008 R2 AD and several Win 2008 R2 member servers running on VM

I have approx 6 top level domains and have added these to the UPN suffixes but I'm a little worried as to whether I should just change the UPN's to the actual email address, so Jon-Doe@contoso.local will become Jon.Doe@contoso.com and then leave the pre-windows 2000 UPN as is, contoso\Jon-Doe,  but I'm worried what effect that will have on users logging onto their machines/resources

Is my plan good, bad, terrible or what should I do?
LukeFileWalkerAsked:
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Vasil Michev (MVP)Connect With a Mentor Commented:
It will only affect users that actually login via the UPN, those using the samaccountname method will not notice any change.
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LukeFileWalkerAuthor Commented:
Thanks Vasil
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