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exchange online and on premise

Hi Experts 

we got a very big problem on our locla data center 

so we start ot rebuild the systems  and restore from backup 

but during this time becuse we have office 365 

so we activated all our users to access the emails from exchange online 

Note : before the problem the all mailboxes located in our data center 

now the user since weeks using exchange online 

so what the best way or tool to merge the old mailboxes which usaed to be on premise with the mail boxes on exchange online 

for example user sword now working since week on exchange online and 

whaen we recover the old exchange  what we can do 

option 1 

export every mailbox as pst file and try to use tool like codetwo 

or instal new exchange and importn the data bases then make coexsist configuration and migrate or merge i dont know the mail boxes 

do you know the best way or tool to do such crazy thing 


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a great answer

do you think codetwo tool can help to import pst file to a mailboxes or do you know another tool 
All 3rd party tools will take time to import PSTs, Depends on the size though.
I recommend to upload the PSTs to Azure Storage and import.
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azure storage like blob ?
and it will be kind if you doc how to import or merge pst with Mail box on exchange online