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Fix Outlook Problems When Two Accounts Use the Same Email Address
Question details
The user needs to resolve an issue where two Outlook accounts or profiles are configured with the same email address, causing discrepancies in email history and signature settings.
- Product
- Microsoft Outlook
- Device & OS
- not provided
- Scenario
- Managing email accounts and profiles in Microsoft Outlook for a Microsoft 365 Business Standard account.
- Observed behavior
- One account profile displays older emails and applies default signatures correctly, while the duplicate profile using the same email address is missing older messages and signature settings.
Verify whether you are using Classic Outlook, New Outlook, or Outlook on the Web, and ensure you have your Microsoft 365 Business Standard administrator credentials or contact information ready.
Check Local Profiles and Create a Microsoft 365 Service Request
Because this involves a Microsoft 365 Business Standard account, checking for duplicate local profiles and reaching out via the admin center is the most effective resolution.
Duplicate profiles can cause synchronization conflicts where one profile acts as the primary data file and the other fails to pull legacy data from the Exchange server. Identifying your client version and contacting Microsoft support can resolve backend routing issues.
Check if the issue occurs in Classic Outlook, New Outlook, or Outlook on the web. Note this information for troubleshooting.
If you are an administrator, log in to the Microsoft 365 admin center using your global administrator credentials.
Navigate to 'Help and support', select 'Contact support', clearly describe the duplicate account and missing email issue, and submit the service request.
If you are an end user without administrative rights, contact your global administrator and ask them to submit the service request on your behalf.
Remove the Duplicate Profile in Windows Control Panel
Removing the corrupted or redundant profile forces Outlook to rely on the correct account setup that contains your signatures and older emails.
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Frequently Asked Questions
Why does Outlook create two accounts for the same email address?
This typically happens during an Office migration, when re-adding an account without removing the old one, or if there is a conflict between an Exchange account and an IMAP/POP setup configured for the same email address.
Will deleting a duplicate Outlook profile delete my emails?
Deleting an Outlook profile only removes the local configuration and cached data. As long as your emails are stored on the Microsoft Exchange server or you keep the primary profile intact, your emails remain safe.
Why are my signatures missing in one of the Outlook profiles?
Signatures are often saved locally per profile or device. If a new or duplicate profile is generated, it will not automatically inherit the local signature files from your original setup.
How can I tell if I am using Classic Outlook or New Outlook?
New Outlook has a toggle switch in the top right corner labeled 'Try the new Outlook' or 'New Outlook'. If the interface strongly resembles Outlook on the web, you are using the new version. Classic Outlook features the traditional File ribbon menu.
