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.