Run our legacy application on Edge Natively

Sachidhanantham Ramalingam 16

We are using a legacy web application (ASP.NET with VB Core) which was developed using VS2003 Framework 1.1 and used IE5 bowser, now we migrated our application to VS2019 Framework 4.8.

As you know Microsoft has stopped IE browser support and asked to use Edge browser (with IE mode if needed), so we are decided to run our application in Edge using Compatibility mode:IE5 (OR) Edge natively.

Note: Our preference for Edge natively

Please refer the attached “IE to Edge Queries.docx” for steps which we followed to launch our application in Edge and “site.xml" for compatibility settings.

Can you please provide some guidance to achieve this requirement without making any major code change in our application.

Thanks,

--Sachi…

ShiJieLi-MSFT 11,351 Reputation points Microsoft Vendor

2025-01-31T05:57:04.7+00:00

Hi @Sachidhanantham Ramalingam,

May I know if you have any further question on this issue?
Sachidhanantham Ramalingam 16 Reputation points

2025-01-31T06:57:14.2133333+00:00

Hi ShiJieLi-MSFT,

We are in discussion with client that which option going take either “Compatibility Mode : IE5“ in Edge by altering Group Policy (OR) support Edge Natively.

We will post queries incase if go with option support Edge Natively.
ShiJieLi-MSFT 11,351 Reputation points Microsoft Vendor

2025-01-31T07:10:21.01+00:00

Hi @Sachidhanantham Ramalingam,

Good to learn. Please feel free to let us know.

1 answer

Yu Zhou-MSFT 14,511 Reputation points Microsoft Vendor

2025-01-22T09:20:42.7866667+00:00

Hi @Sachidhanantham Ramalingam

The policies you configure are almost right. For this policy Configure the Enterprise Mode Site List, you can set the value to file:///D:/site.xml.

After you set the group policies, there's no need to set registry settings again. The registry path you show in pdf is not right. The right registry setting for policy Configure the Enterprise Mode Site List should be like this:

If the issue persists, please open edge://policy/ page and edge://compat/iediagnostic page in Edge browser in machine B and provide the screenshots of the pages. Please also provide your D:/site.xml file for checking.

If you want your app to work in Edge natively, you'll have to change the old code totally to make it compatible with Edge. There's no way to achieve this without making major code changes.

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Yu Zhou
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Sachidhanantham Ramalingam 16 Reputation points

2025-01-22T09:30:57.51+00:00

Thanks for your response.

I can set “Compatibility Mode : IE5“ in Machie B and made our application works by altering site.xml and Edit Group Policy.

As per our requirement, application should work in Edge Natively WITH OUT settings IE Mode.
If i set “Compatibility Mode : IE5“ in our client machine by adding site.xml in Edit Group Policy and make it work then how long the Microsoft will provide the support for this kind of settings?

Thanks,

--Sachi...

MotoX80 35,416 Reputation points

2025-01-22T13:16:50.54+00:00

As per our requirement, application should work in Edge Natively WITH OUT settings IE Mode

Have your web developer launch Edge normally and then press F12 to open the developer tools. Select the Console tab and then browse your site.

Have your developer correct any errors that Edge reports.

I think that would be a good place to start.

https://learn.microsoft.com/en-us/microsoft-edge/devtools-guide-chromium/console/

There are other tools in Edge that can help you.

https://learn.microsoft.com/en-us/microsoft-edge/devtools-guide-chromium/elements-tool/elements-tool

Yu Zhou-MSFT 14,511 Reputation points Microsoft Vendor

2025-01-23T01:44:00.49+00:00

Hi @Sachidhanantham Ramalingam

Support for IE mode follows the lifecycle of current and future Windows client, Windows server, and Windows IoT releases (including Windows 11) at least through 2029. Additionally, Microsoft will give one year of notice before retiring the IE mode experience when the time comes.

For detailed information, you could refer to How long will IE mode be supported? part in this blog: Internet Explorer 11 desktop app retirement FAQ.

Sachidhanantham Ramalingam 16 Reputation points

2025-01-23T05:02:36.4133333+00:00

Thanks for your responses.

Could you please provide your suggestions for below queries.
Can we set “Compatibility Mode : IE5“ in Edge without IE installed machine then run our legacy application?
Does all Windows client, Windows server, and Windows IoT releases (including Windows 11) have IE (OR) IE Mode compatibility installed/support by default? OR install as part of Edge installation?

Thanks,

--Sachi...

Yu Zhou-MSFT 14,511 Reputation points Microsoft Vendor

2025-01-23T06:52:40.23+00:00

Hi @Sachidhanantham Ramalingam

No, IE mode relies on IE to function. If without IE feature installed, IE mode will no longer work.

According to my experience, yes. They have IE mode feature installed by default. Take Windows 11 as an example, you can find it in Windows Settings> System> Optional features> Internet Explorer mode. It has nothing to do with Edge installation.

Yu Zhou-MSFT 14,511 Reputation points Microsoft Vendor

2025-01-27T03:27:02.3233333+00:00

Hi @Sachidhanantham Ramalingam

May I know if you have any other question regarding this problem? Please let me know if there is anything that I can help here.

Sachidhanantham Ramalingam 16 Reputation points

2025-01-27T03:39:21.57+00:00

Hi Yu Zhou-MSFT,
We are in discussion with Client that which option going to take either “Compatibility Mode : IE5“ in Edge by altering the Group Policy (OR) support Edge natively.

Based on our decision will get back to you for further query.Thanks for your support and will post any other questions in this same session if needed.

Thanks,

--Sachi...

Yu Zhou-MSFT 14,511 Reputation points Microsoft Vendor

2025-01-27T03:47:21.2233333+00:00

Hi @Sachidhanantham Ramalingam

Thanks for your reply. Looking forward to the results of your discussion.

Sachidhanantham Ramalingam 16 Reputation points

2025-01-27T03:47:37.33+00:00

Hi Yu Zhou-MSFT,

Thanks for your response.

We are in discussion with client that which option going take either “Compatibility Mode : IE5“ in Edge by altering Group Policy (OR) support Edge Natively.

Based on your input we need to rewrite the entire code to support Edge Natively - Is my understanding correct?

Thanks,

--Sachi...

Yu Zhou-MSFT 14,511 Reputation points Microsoft Vendor

2025-01-27T03:54:32.9633333+00:00

Hi @Sachidhanantham Ramalingam

Basically 'Yes'. Many IE codes are not compatible with Edge. You need to open F12 DevTools to check the errors in console and rewrite the incompatible part.
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Run our legacy application on Edge Natively

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