Can .pst file be located in Onedrive?

It won't work in most services and is not recommended in any service. Outlook puts a lock on the pst file when the pst file is open. OneDrive (and other cloud solutions) continually syncs the local folder. It won't be able to sync the pst because Outlook has a lock on it and as a result, the pst file could become corrupted and data loss occur.

Switching to apple seems like a dramatic solution.

Without my own intention my .pst was installed in the OneDrive folder in my desktop and it worked normally. Because I did not note that never tryied to access the file from another pc. Due to OneDrive advised about limit of space to 5 Gb I had to delete some files and found the .pst one. Now I moved it but always worked.

I too have been a loyal Microsoft user since the days of DOS and audio cassette backups. I just read through this thread thinking that by now this issue would be solved. Hard to believe that it's not. I'm not in the market for a new computer, but when that day comes, I'll have to look into a MAC. PS - MCSE here...

ColorfulCow:  The method you  describe is the correct one, and it is the way to resolve the problem with your email messages.  Except that I also stopped the group where the email account was from synching. That´s what I did myself.  However, The problem is that this method only handles the email messages.  It doesn´t handle the issue of Contacts, Calendar, Tasks, and Notes.  Those four sets of things continue to stay in the .pst file, and , if your goal was to handle all of the above, it doesn´t resolve the whole problem.  So, if that was your goal, you would be back to -almost- square one.

As I think I mentioned in an earlier message here in this thread, after months, if not years, of trying to figure out how to resolve this problem, I did resolve it by moving to a Mac.  Now, everything is automagically synchronized among all my devices.  It took me a long time to gather the courage to do it, because I have been a PC and Windows user since 1983, when I started using my first IBM XT with a 10MB hard drive.  And after many decades of being a Microsoft/Windows user, my whole life was in the Windows environment.  Well, I did it about six months ago, and it was easier than I thought.  I must say that I am very glad I did the move, and I doubt that I will ever go back to Windows.

I am a little puzzled as to what the problem is.

This is what I did when I was dealing with a similar problem. I am not an expert but this worked fine for me.

1. change the settings of your pop account so that it is no longer able to download any emails from the server (without deleting the POP account), so delete POP server addresses etc.;
2. create a new IMAP account for Gmail in Outlook (inbox should be almost empty as most emails would already have been downloaded into the POP account and then  presumably deleted from the Gmail server)
3. manually drag email folders within Outlook from the inactive POP account into the new (IMAP) inbox. You obviously only need to do this once.
4. when done and comfortable you can remove your POP account

This will move your old POP folders to your new IMAP inbox and will then sync all these folders across all IMAP devices.

At no point do you need to look at your pst file paths etc. Everything is done from Outlook. You just need to make sure that your IMAP inbox is large enough to accommodate the folders and emails that you need when on the road. In my case, I keep very old emails in a separate pst file on one of my computers (I could probably store this in OneDrive if I wanted to, but have not tried this; multiple device access might corrupt the file I imagine). All this year's emails are in subfolders in my IMAP inbox and synced across all my devices.

Am I missing something?