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Hi, I recently had a long session with a Microsoft support agent to clean up some issues I was having with Outlook Classic, all all issues were resolved, Outlook Classic worked well and the agent signed off. The next time I used my computer and fired up Outlook, I didn't realize it when it was asking me for my password, but it was New Outlook. So, now I have both New Outlook and Outlook Classic pulling from the same data file. I suspect this will lead to some sort of issues down the road (or maybe sooner.) Can I just delete the account from New Outlook or will that cause problems (e.g., corrupt the data file) so when I fire up Outlook Classic there are more issues? Working in Windows 11 on a Dell desktop with MS 365 Home. Thanks in advance!!
Using New Outlook on Windows for personal email, calendar, and contact management
Hi! Let me help you.
Yes, you can safely remove the account from New Outlook without affecting Outlook Classic. New Outlook and Outlook Classic do not share the same local data file, so removing the account from New Outlook will not corrupt your Outlook Classic data or profile.
AI answer
Deleting the account from new Outlook will not corrupt the data file used by classic Outlook.
New Outlook and classic Outlook are separate applications. Classic Outlook continues to use its own profile and data configuration. Removing an account from new Outlook only affects that app’s connection to the mailbox and does not change or damage the data file that classic Outlook uses.
To avoid confusion or duplicate access, remove the account only from new Outlook and continue using classic Outlook as configured by the support agent. If any issues appear later in classic Outlook (for example, sync or password prompts), use the classic Outlook troubleshooting guidance in Troubleshoot Outlook email setup and I can't send or receive messages in Outlook.
If at some point switching between classic and new Outlook is needed, ensure the “Try the new Outlook” toggle behavior and policies are configured correctly as described in the deployment guidance.
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