I’ve been running my own mail server for years now, started off with the default mail server in Windows Server 2003, but quikcly moved to Exchange 2010 > 2013 and now I’m still on 2016. However, I really want to go open source. And fast, since my Exchange 2016 server has been compromised, and is sending out spam, I really want to move on to a clean server.
I can obviously upgrade to a newer Exchange version, and migrate everything, or even just setup a new 2016 server, and migrate everything, to get rid of my spam issues. However, I think it’s better to go with a proper open source solution, like mail-in-a-box, I hear and read a lot of good things about it.
However, I can’t really figure out if there is a way to migrate my Exchange 2016 mailboxes to mail-in-a-box. Can somebody tell me if this is possible?
There are various imap sync tools. I know of imapsync, but haven’t used it myself.
How difficult will depend on how many mailboxes, as it seems to be a fairly manual per-mailbox process. If you’ve only a few users, imapsync looks like the normal way to go.
Several users have reported successfully migrating by copying and pasting through mail clients such as Thunderbird, but that will vary a lot based on how large the accounts are and your upload connection.
There are about 20 mailboxes (5 domains), most of them are 2-5GB in size, 2 of the mailboxes are not mine, so I don’t have access to them.
I will be moving the AD and Exchange VMs to a new physical server, and put the mail-in-a-box VM on that same server, so if I can copy directly from one server to another, speed should not be an issue.