Bepaalde outlook contactpersonen (nieuwe outlook) kan ik niet verwijderen.

Hi Kai; see enclosed.

Dear Microsoft Support Team,

I am experiencing a persistent issue with contacts in my Microsoft account.

The main problem is that many existing contacts are visible in Outlook.com and New Outlook for Windows, but cannot be edited or deleted. Newly created contacts work correctly.

We have performed extensive troubleshooting and would appreciate a technical investigation, preferably at the server level.

1. Problem description

Outlook.com and New Outlook display approximately 485 contacts.

Attempting to delete certain existing contacts results in the error: "Cannot delete contacts."

Existing contacts can be edited, but changes are not saved.

Some contacts appear multiple times.

Certain contacts are visible in Outlook.com but cannot be found in Outlook Classic.

Removing and re-adding the Outlook account does not resolve the problem.

For example, the contact Albert van Eijnsbergen appears twice in Outlook.com but is not present in Outlook Classic.

2. Troubleshooting already performed

Outlook and synchronization

Removed and re-added the Hotmail account in New Outlook.

Created a completely new Outlook Classic profile containing only the Hotmail account.

Compared the contact lists: approximately 485 contacts in New Outlook versus 434 in Outlook Classic.

Verified that newly created contacts synchronize correctly between Outlook Classic, New Outlook and Outlook.com.

Confirmed that newly created contacts can be edited and deleted successfully across these environments.

Microsoft Teams and mobile devices

Investigated contact synchronization from Microsoft Teams, iPhone, iPad and Outlook.

Disabled or removed all contact synchronization connections in Teams.

Confirmed that the problematic Outlook.com contacts remained.

Microsoft ContactsCleanup.exe

Executed Microsoft's official contact cleanup utility.

Result:

No results returned. Nothing to clean up!

The tool therefore did not identify any records eligible for cleanup.

Microsoft Graph Explorer

Signed in with the affected Microsoft account and granted Contacts.Read permission.

Tests performed:

GET /me/contactFolders → HTTP 200 OK, "value": []

GET /me/contacts → Initially HTTP 200 OK, "value": []

After creating a new test contact, GET /me/contacts successfully returned that contact, including its unique ID and folder information.

This confirms that newly created contacts are accessible through Microsoft Graph.

The older problematic records have not been identified through the Graph queries performed so far. A targeted search for a specific older contact has not yet been conclusively completed.

Outlook Classic folder investigation

Using Outlook Classic's import wizard, we discovered several additional contact-related folders, including:

Folders with GUID-style names.

A folder named hiddenFolder-....

GAL Contacts.

Organizational Contacts.

PeopleCentricConversation Buddies.

Recipient Cache.

These folders are not normally visible in the standard Outlook contacts view.

We considered using MFCMAPI to investigate these folders, but no destructive operations or confirmed folder-level repairs have been performed.

3. Contact export and backup

We exported the existing contact data to CSV and compared it with another contacts export.

The Outlook.com export contained approximately 550 records, whereas the Outlook.com interface showed approximately 485 contacts.

Duplicate contact records and overlapping information were identified. A combined and deduplicated CSV file has been prepared, but it has not been imported as a replacement because the original problematic contacts cannot be removed reliably.

4. Current findings

Based on these tests:

General contact synchronization is functioning correctly.

Newly created contact records can be managed normally.

The issue appears to affect specific older contact records.

Some existing contacts are visible in Outlook.com but not through Outlook Classic.

Microsoft ContactsCleanup.exe did not resolve the issue.

Reinstalling or reconfiguring Outlook does not resolve the issue.

We suspect that some contacts may be legacy, orphaned, or otherwise incorrectly linked contact records originating from an older synchronization mechanism.

However, the actual underlying cause has not yet been established.

5. Request for Microsoft Support

Could you please investigate the following?

Why are certain existing contacts displayed in Outlook.com but cannot be edited or deleted?

Are these contacts stored in a legacy, hidden, or incorrectly linked contacts folder or contact store?

Why are some records missing from Outlook Classic and the Microsoft Graph results?

Is there a supported method to repair or remove these records on the server without affecting valid contacts?

Can this case be escalated to the Outlook.com Contacts engineering/backend support team if necessary?

Our objective is to regain full control over the contact list, eliminate invalid and duplicate contacts, and maintain reliable synchronization between Outlook.com, Outlook Classic, iPhone Contacts and WhatsApp.

We can provide screenshots, Microsoft Graph responses, the ContactsCleanup.exe results and CSV exports through a secure support channel.

Given the extensive troubleshooting already completed, we would appreciate a technical investigation rather than repeating standard procedures such as reinstalling Outlook or removing and re-adding the account.

Thank you for your assistance.

Kind regards,

Willem Verhoef

Dear Microsoft Support Team,

I am experiencing a persistent issue with contacts in my Microsoft account.

The main problem is that many existing contacts are visible in Outlook.com and New Outlook for Windows, but cannot be edited or deleted. Newly created contacts work correctly.

We have performed extensive troubleshooting and would appreciate a technical investigation, preferably at the server level.

1. Problem description

Outlook.com and New Outlook display approximately 485 contacts.

Attempting to delete certain existing contacts results in the error: "Cannot delete contacts."

Existing contacts can be edited, but changes are not saved.

Some contacts appear multiple times.

Certain contacts are visible in Outlook.com but cannot be found in Outlook Classic.

Removing and re-adding the Outlook account does not resolve the problem.

For example, the contact Albert van Eijnsbergen appears twice in Outlook.com but is not present in Outlook Classic.

2. Troubleshooting already performed

Outlook and synchronization

Removed and re-added the Hotmail account in New Outlook.

Created a completely new Outlook Classic profile containing only the Hotmail account.

Compared the contact lists: approximately 485 contacts in New Outlook versus 434 in Outlook Classic.

Verified that newly created contacts synchronize correctly between Outlook Classic, New Outlook and Outlook.com.

Confirmed that newly created contacts can be edited and deleted successfully across these environments.

Microsoft Teams and mobile devices

Investigated contact synchronization from Microsoft Teams, iPhone, iPad and Outlook.

Disabled or removed all contact synchronization connections in Teams.

Confirmed that the problematic Outlook.com contacts remained.

Microsoft ContactsCleanup.exe

Executed Microsoft's official contact cleanup utility.

Result:

No results returned. Nothing to clean up!

The tool therefore did not identify any records eligible for cleanup.

Microsoft Graph Explorer

Signed in with the affected Microsoft account and granted Contacts.Read permission.

Tests performed:

GET /me/contactFolders → HTTP 200 OK, "value": []

GET /me/contacts → Initially HTTP 200 OK, "value": []

After creating a new test contact, GET /me/contacts successfully returned that contact, including its unique ID and folder information.

This confirms that newly created contacts are accessible through Microsoft Graph.

The older problematic records have not been identified through the Graph queries performed so far. A targeted search for a specific older contact has not yet been conclusively completed.

Outlook Classic folder investigation

Using Outlook Classic's import wizard, we discovered several additional contact-related folders, including:

Folders with GUID-style names.

A folder named hiddenFolder-....

GAL Contacts.

Organizational Contacts.

PeopleCentricConversation Buddies.

Recipient Cache.

These folders are not normally visible in the standard Outlook contacts view.

We considered using MFCMAPI to investigate these folders, but no destructive operations or confirmed folder-level repairs have been performed.

3. Contact export and backup

We exported the existing contact data to CSV and compared it with another contacts export.

The Outlook.com export contained approximately 550 records, whereas the Outlook.com interface showed approximately 485 contacts.

Duplicate contact records and overlapping information were identified. A combined and deduplicated CSV file has been prepared, but it has not been imported as a replacement because the original problematic contacts cannot be removed reliably.

4. Current findings

Based on these tests:

General contact synchronization is functioning correctly.

Newly created contact records can be managed normally.

The issue appears to affect specific older contact records.

Some existing contacts are visible in Outlook.com but not through Outlook Classic.

Microsoft ContactsCleanup.exe did not resolve the issue.

Reinstalling or reconfiguring Outlook does not resolve the issue.

We suspect that some contacts may be legacy, orphaned, or otherwise incorrectly linked contact records originating from an older synchronization mechanism.

However, the actual underlying cause has not yet been established.

5. Request for Microsoft Support

Could you please investigate the following?

Why are certain existing contacts displayed in Outlook.com but cannot be edited or deleted?

Are these contacts stored in a legacy, hidden, or incorrectly linked contacts folder or contact store?

Why are some records missing from Outlook Classic and the Microsoft Graph results?

Is there a supported method to repair or remove these records on the server without affecting valid contacts?

Can this case be escalated to the Outlook.com Contacts engineering/backend support team if necessary?

Our objective is to regain full control over the contact list, eliminate invalid and duplicate contacts, and maintain reliable synchronization between Outlook.com, Outlook Classic, iPhone Contacts and WhatsApp.

We can provide screenshots, Microsoft Graph responses, the ContactsCleanup.exe results and CSV exports through a secure support channel.

Given the extensive troubleshooting already completed, we would appreciate a technical investigation rather than repeating standard procedures such as reinstalling Outlook or removing and re-adding the account.

Thank you for your assistance.

Kind regards,

Willem Verhoef