What would be the point of backing up a large file, restoring it to a new system then deleting it from the new system? I just leave them behind as I mentioned.
I'm curious what everyone else does and why. Wondering what the pluses and minuses are for each approach.
I never...ever....ever...bring over an OST. I don't feel the need. Of course, I work with Microsoft Exchange...where "all" the data is kept in the users mailbox on the server, and the OST is purely a locally cached copy of there, there is zero data loss to the end user to not bring over the OST. It's not like it will have calendar entries or contacts that aren't on the mail server.
The OST is sometimes prone to corruption. If Outlook is having issues on an old computer, connected to Microsoft Exchange...a quick fix is to close Outlook and NUKE that OST file. Poof...gone. Open Outlook...let it rebuild the mailbox, done in a short time.
Calendar entries, Contacts, even signatures...are all stored in the mailbox on the server. (if 365, which is what I live in) Nothing needed to bring over.
When setting up new user profiles, I like things to be squeaky clean. fresh start. Moving over "stuff" from the old profile often brings over....garbage, the chance for bringing over hiccups. No reason to bring over an old, possibly wobbly OST. Zero reason! I auto configure Outlook usually...with InTune policies. But even manually, with autodiscover it's so easy a blind caveman can do it. Launch...autodiscover, password and MFA if needed, go to account settings, slide bar all the way to the right to download all email, poof, done! Let it cook for a few minutes, all done.
Unless you're on dial up with a computer with a 4800rpm spinner and just 4 gigs of RAM, or a really really weak gen1 DSL connection..with a HUGE mailbox....the OST rebuilds very quickly. And I say this knowing I have many users with well over 25, 30, 40, 50, even 75 or 90 gigs or larger mailboxes.
Granted I'm an Exchange/Microsoft 365 guy...with over 2,500 mailboxes under our watch across many different clients, but we are starting to (unfortunately) get a small handful of clients on Google Workspace. I'm a firm believer in Google email being used as Google intended, via browser. But for those who insist on using Outlook with Google ...(which..I thoroughly and completely detest)...yes there is some info there..."On this computer only"....so you are stuck having to retrieve those OSTs....and export as a PST....so you can import if needed...like if you're upgrading to 365.