Office Settings & Configuration

How to Change the Default Outlook Account for Meeting Invitations

Huda Qurayshi Oct 8, 2026 869 views

Question details

The user needs to configure Outlook to send meeting invitations from the correct default email account and avoid data file errors related to PST and OST conversions.

How to Change the Default Outlook Account for Meeting Invitations

Product: Microsoft Outlook
Device & OS: not provided
Scenario: Sending meeting invitations from an Outlook application configured with multiple email accounts.
Observed behavior: Outlook sends meeting invitations from the wrong email account and may prompt the user about converting PST files to OST files.

Before you start

Ensure you have the login credentials for the email account you want to set as default, and close any active meeting invitation drafts before modifying your account settings.

Solution 1Recommended

Set the Desired Email Account as Default in Outlook

Use the built-in Outlook Account Settings to assign your preferred email address as the primary sender for all outgoing meetings and emails.

By default, Outlook uses the primary account added to your profile to send meeting invitations. Changing the default account in your settings will ensure that all new calendar invites originate from the correct email address.

Open Account Settings

Launch Microsoft Outlook. Click on the 'File' tab in the top-left corner, select 'Info', and then click on 'Account Settings' followed by 'Account Settings...' from the drop-down menu.

Select the Default Account

In the Account Settings window, navigate to the 'Email' tab. Click on the email account you wish to use for meeting invitations to highlight it, then click the 'Set as Default' button.

Restart and Test

Close the Account Settings window and restart Outlook. Create a new meeting invitation to verify that it now sends from the newly assigned default account.

Set the Desired Email Account as Default in Outlook

Important notice regarding data files: Never manually rename a PST file to an OST file. OST files are created and managed automatically by Outlook for supported Exchange accounts. Renaming them manually will corrupt your data files and prevent Outlook from syncing properly.

Solution 2

Verify the Primary Account in the Outlook Mail Profile

If changing the default account within Outlook doesn't resolve the issue, verify that your default data file aligns with your desired primary account via the Windows Control Panel.

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Frequently Asked Questions

Why does Outlook send calendar invites from the wrong account?

Outlook sends invitations from the account set as the default in your Account Settings. If you have multiple email accounts configured, Outlook will automatically default to the primary account initially added to the profile unless you manually change it.

Can I just rename my PST file to an OST file to use Exchange?

No, you should never manually rename a PST file to an OST file. An OST file is an offline folder file created automatically by Outlook when you connect to an Exchange server. Manually renaming a PST file will not convert its format and can corrupt your email data.

How do I know which Outlook data file is currently set as default?

You can check your default data file by navigating to File > Info > Account Settings > Account Settings, and clicking on the 'Data Files' tab. The file displaying a checkmark next to it is your current default data file.

Do I need to restart Outlook after changing the default account?

Yes, it is highly recommended to close and restart the Outlook application after modifying your default email account or data file settings to ensure the changes take full effect for all new communications.

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