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What to do about an out-of-date .ost file?
I'm upgrading the SSD in my laptop, so I cloned the old one onto a bigger one and swapped them. Windows (finally) boots fine, with all my apps intact. When I launch Outlook however, it tells me it'...
Just delete the ost file as recommended then restart Outlook. It will rebuild an up to date ost very quickly.
The ost file shouuld be in folder "C:\Users\<username>\AppData\Local\Microsoft\Outlook\" unless you have moved it.
OST files are like a copy of all of your online data from IMAP or Exchange mailboxes. You don't need them unless you have data not on the server. Make a new Outlook profile and a OST will be recreated.
