![]() ![]() Microsoft does not guarantee the accuracy of this information.) (Please Note: Since the web site is not hosted by Microsoft, the link may change without notice. For more information, please check this article: Set Another Data File as Default When Using an Exchange Account. ![]() If you actually want to use these accounts in one Outlook profile and change the default data files, as a workaround, you can try to add your exchange account again and turn off your cached exchange mode in the control panel when you just add your exchange account. So, I’m afraid this issue may be by design. And this could be reproduced in different versions of Outlook such as Outlook 2016 and Outlook 365. When changing other data files as the default data file, we will get the same error prompt as you. If this is your case, according to my tests, I configured several IMAP accounts and Exchange accounts in one Outlook profile, and found that in this case, exchange account data file will always be set as the default data file. So, are your three accounts IMAP accounts? ost file usually be used to data files for IMAP accounts and Exchange accounts. ost and one is an exchange server account.Īs I know.
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