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I have always had .PST for my home email file, now I changed IPSs and set up my account and it's an .OST file--I had no say in the matter nor did I have a say in the name of the file, which I'd like to change but can't. I don't know much about the difference, all I know is the old ISP was a POP3 and the new one is IMAP.
I guess my question is--is that the difference--for POP3 Outlook uses .pst and for IMAP it uses .ost? And are they mutually exclusive?
Thanks, Jim
Yes. PST downloads and keeps the e-mail on your computer. For OST, the mail remains on the server, but only have a cache. If your computer crashes, the you can use another computer and download the e-mail again. For PST, if your computer dies, those e-mails are lost with the computer. Better to have for flexibility and safety. – Sun – 2016-06-06T20:51:50.427