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Outlook *.ost files being created instead of *.pst
I upgraded to Win10/Office 2016 from Win7/Office 2013. At the same time, I changed my web mail (Gmail) from POP3 to IMAP. Since the upgrade, Outlook creates *.ost data files instead of *.pst data files.
As far as I am able to determine, *.ost files are a product of or are otherwise related to an Exchange server, with which I am not associated., i.e., I am using my home custom PC. I also log in to Win10 with a local (vs. Microsoft) account. In Outlook, Work Offline in Send/Receive preferences is grayed out and red Xed; the Outlook icon in the task bar is also red Xed.
All of my searches about this issue relate it to Outlook behavior with an Exchange server. Not being on an Exchange server, I can find no solutions. When I first set up Win10, I logged on using a MS account but no longer do so. Nevertheless, I am wondering if I am tied to MS servers.
My question: however I accomplish it, how do I tweak Outlook to create *.pst data files instead of the *.ost data files.
Thanks for your consideration,
Monk