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We're going to be migrating our Exchange environment to Office 365 but I'd like to create local backups of each mailbox before doing the final migration.

If I create a .PST backup of a mailbox will that remove those emails from our Exchange server?

It has been a long time since I did anything with .PSTs and I just don't remember. However, I want to ensure that by backing up these emails to PST it will not remove them from our server.

Thanks in advance.

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Probably not, I believe it just copies them. Try it with just a few to test. – Enigma Apr 30 '13 at 20:41
up vote 0 down vote accepted

No, it won't and you could easily copy mails back if you for some reason would lose Mail on the Server.

Its sort of a private Copy (hence the name "Personal Storage Table") of your Mails. Thats why a lot of Server Admins disable this feature, to make sure a Client cannot copy his Mail elsewhere.

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