Migrating to office 365 E3

Already started moving from physical servers to office365 E3. As migration may be hectic at the moment. Is it the good idea to start email services at O365 and migrate old pst of email account at some later point. Would that make any difference?
ZeeKAsked:
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AmitIT ArchitectCommented:
If you are planning to create new id for current users and merging the data. I don't see any issue. Once migration is over, you can either switch back data to old id again. Only issue is extra admin effort. If user base is low, that won't be an issue.
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JohnBusiness Consultant (Owner)Commented:
Delaying the migration of the PST files will help you. But your users may not be happy. It really comes down to that choice so far as I can see and only you (and your users) can make it.
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ZeeKAuthor Commented:
Planning to create same ids as old server and merge data at later stage. Would that be ok?
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JohnBusiness Consultant (Owner)Commented:
Yes. that will work. Make sure your users understand your plan.
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JohnBusiness Consultant (Owner)Commented:
Thank you, and I was happy to help.
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Mohammed HamadaSenior IT ConsultantCommented:
Depends on how you are migrating emails and users? do you have hybrid integration or you are using IMAP Migration?
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ZeeKAuthor Commented:
I would only keep pst files of old emails. To upload and merge them directly to office 365
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