We have a business that uses Office365 and we want to be able to save all the emails locally. I found a thread on Office365 community pertaining to this and basically it was stated that there is no direct way of accomplishing this. I am curious if anyone has considered this and if there is a good method for storing these emails locally, even if it's some nifty PowerShell programming. All I've come up with is having a master mailbox which can view all mailboxes, and just have it sync and archive locally to the computer. I have not tried this yet, as the storage file sounds like it will be huge, so this does not seem like a fantastic idea and I'm open to any suggestions!
This is a great question. We ran into a problem with O365 many months ago where the AD sync tool caused all of our mailboxes to be deleted. It took close to a week for MSFT to restore all of the mailboxes for us. Either way they recommend having off-site backups as they are ultimately not responsible for data loss if it happens, other than what is in the SLA.
We worked with MessageOps as they have a tool for downloading mailboxes administratively that works pretty well. It's free if you list them as your partner of record in O365.
Please check this link, it is the export tool within O365