Moving from Classic Outlook to New Outlook?
Microsoft is steadily transitioning users from Classic Outlook to the New Outlook experience across Microsoft 365. While the New Outlook offers a modern interface and better cloud integration, many traditional desktop features and COM add-ins used by business users are no longer supported.
If your workflow depends on tools such as email filing, send-and-file, or Outlook productivity add-ins, it is important to understand what changes before making the switch.
This guide explains:
- the differences between Classic Outlook and New Outlook
- what features are missing
- why COM add-ins no longer work
- what alternatives exist
- how businesses can transition successfully
Moving from Classic Outlook to New Outlook — Summary
New Outlook is Microsoft’s modern Outlook experience built around Microsoft 365 web technologies. Unlike Classic Outlook, it does not support traditional COM add-ins, VSTO add-ins, or VBA macros.
Organizations moving to New Outlook should evaluate which Outlook workflows depend on legacy desktop technologies and identify modern Microsoft 365-compatible replacements for email filing, send-and-file, security, and productivity workflows.
Users who rely on older Outlook add-ins often need modern alternatives that work across New Outlook, Outlook Web, and Outlook for Mac.
What Is the Difference Between Classic Outlook and New Outlook?
Classic Outlook (Win32 Outlook)
Classic Outlook is the traditional desktop version of Microsoft Outlook for Windows. It supports:
- COM add-ins
- VSTO add-ins
- VBA macros
- PST files
- deep Windows integrations
- local desktop workflows
Many business productivity tools were built specifically for this environment.
New Outlook
New Outlook is Microsoft’s modern Outlook application built around Microsoft 365 web technologies and Office web add-ins.
It provides:
- a more modern interface
- improved cloud integration
- better consistency across devices
- simplified deployment and management
However, New Outlook does not support many legacy desktop technologies used by older Outlook add-ins.
Why Many Outlook Add-ins Stop Working in New Outlook
One of the biggest migration challenges is that COM add-ins and VSTO add-ins are not supported in New Outlook.
This affects many long-standing Outlook productivity tools used by businesses.
Common examples include:
- email filing tools
- send-and-file workflows
- desktop automation tools
- VBA-based solutions
- older CRM integrations
- custom Outlook plugins
Microsoft is moving New Outlook toward a web-based add-in model instead of traditional Windows desktop integrations.
For a deeper technical explanation, see:
Features Missing in New Outlook
The exact impact depends on your workflow, but users commonly discover that some familiar features are unavailable or behave differently.
Commonly Missing or Changed Features
| Feature | Classic Outlook | New Outlook |
|---|---|---|
| COM Add-ins | Supported | Not Supported |
| VSTO Add-ins | Supported | Not Supported |
| VBA Macros | Supported | Not Supported |
| PST File Support | Full | Limited/Changing |
| Send & File Workflows | Common | Depends on Modern Add-in |
| Deep Windows Integration | Full | Reduced |
| Offline Workflows | Strong | More Cloud-Focused |
| Legacy Integrations | Common | Often Unsupported |
Should Businesses Move to New Outlook Yet?
For many organizations, the answer depends on which Outlook workflows are business-critical.
Businesses should evaluate:
- which add-ins users rely on
- whether modern replacements exist
- compliance and security workflows
- email filing processes
- CRM integrations
- productivity automation requirements
Some organizations can transition immediately.
Others may need a phased migration while modern replacements are deployed.
What Happens to Outlook Filing Workflows?
Email filing is one of the areas most affected by the move to New Outlook.
Many older filing tools were built as COM add-ins and therefore do not function in New Outlook.
This includes workflows such as:
- filing emails into Outlook folders
- send-and-file
- project-based email organization
- customer filing workflows
- keyboard-driven filing systems
Organizations moving to New Outlook typically need modern Microsoft 365-compatible alternatives.
Modern Alternatives for New Outlook
The good news is that modern Outlook add-ins can work across:
- New Outlook
- Outlook on the Web
- Outlook for Mac
- Outlook for Windows
This creates a more consistent Microsoft 365 experience.
QuickFile365
QuickFile365 is a modern Outlook filing add-in designed for Microsoft 365 and New Outlook.
It provides:
- fast Outlook email filing
- folder suggestions
- send-and-file workflows
- Microsoft 365 compatibility
- support for New Outlook and Outlook Web
It is designed specifically for organizations transitioning away from legacy Outlook COM add-ins.
What About SimplyFile Users?
Many users searching for New Outlook compatibility are existing users of older filing tools such as SimplyFile.
Because SimplyFile relies on traditional Outlook desktop technologies, users moving to New Outlook often begin searching for modern replacements.
Related article:
How to Successfully Transition to New Outlook
1. Identify Critical Outlook Workflows
List:
- add-ins
- macros
- filing tools
- compliance tools
- automation workflows
Determine which are business-critical.
2. Audit Existing COM Add-ins
Many organizations discover dependencies they were not aware of.
This is especially common with:
- filing tools
- CRM connectors
- security tools
- internal automation solutions
3. Find Microsoft 365-Compatible Replacements
Look for modern Outlook add-ins that:
- support New Outlook
- support Outlook Web
- support Mac
- use Microsoft’s modern add-in framework
4. Run a Pilot Migration
Avoid switching all users immediately.
Test:
- filing workflows
- productivity workflows
- compliance workflows
- user acceptance
- performance
5. Train Users on Workflow Changes
The New Outlook interface and behavior differ from Classic Outlook.
Users may need guidance on:
- filing emails
- managing folders
- using add-ins
- workflow changes
- cloud-based behaviors
Frequently Asked Questions
No. New Outlook does not support traditional COM or VSTO add-ins.
In many environments, yes. Microsoft currently allows users to switch back in many cases, although long-term direction is toward New Outlook.
No. VBA macros are not supported in New Outlook.
Support is more limited and continues to evolve. Organizations relying heavily on PST workflows should evaluate carefully before migrating.
Yes. Modern Microsoft 365 add-ins such as QuickFile 365 are designed specifically for New Outlook compatibility.
Start Using QuickFile 365
Moving from Classic Outlook to New Outlook?
Learn how modern Outlook add-ins work with Microsoft 365.