Limitations
This page describes the known limitations, restrictions and considerations when using Edit in Outlook.
Technical Limitations
Browser & Download Limitations
File Size Limits
| Component | Maximum Size | Reason | Workaround |
|---|---|---|---|
| EML File | 25 MB | Browser download limit | Split large attachments |
| PDF Attachments | 20 MB | Email client limits | Compress PDF |
| Total Email | 30 MB | Outlook/Exchange limit | Use SharePoint links |
| Control Add-in | 100 MB memory | Browser performance | Refresh page |
Browser Specific Issues
- Chrome: Pop-up blocker may block downloads
- Firefox: Encoding issues with non-ASCII characters
- Edge: Occasional timeout with large files
- Safari: Limited PDF preview support
Business Central Platform Limitations
SaaS vs On-Premise
| Functionality | SaaS | On-Premise | Note |
|---|---|---|---|
| Automatic Updates | ✅ | ❌ | SaaS automatic, On-Prem manual |
| Custom Extensions | ⚠️ Limited | ✅ Full | SaaS sandbox restrictions |
| Debug Mode | ❌ | ✅ | SaaS security policy |
| Log Access | ⚠️ Application Insights | ✅ Direct | Different logging approaches |
API Limits
- Requests per minute: 100 (SaaS), Unlimited (On-Prem)
- Session timeout: 30 minutes default
- Concurrent users: Based on license model
Outlook & Office Limitations
Outlook Desktop vs Web
Feature Comparison
| Feature | Desktop | Web | Mobile |
|---|---|---|---|
| EML Opening | ✅ Native | ⚠️ Via browser | ❌ Limited |
| Rich Formatting | ✅ Full | ✅ Full | ⚠️ Basic |
| Attachment Handling | ✅ Full | ✅ Full | ⚠️ Upload only |
| Offline Access | ✅ Full | ❌ None | ⚠️ Limited |
Version Dependencies
- Outlook 2016/2019: Limited EML support
- OWA Legacy: No direct EML opening
- Mobile Apps: Requires desktop preparation step
Exchange & O365 Limits
Email Size Limits
| Platform | Max Message Size | Max Attachments | Max Recipients |
|---|---|---|---|
| Exchange Online | 150 MB | 100 | 500 |
| Exchange 2019 | 35 MB (default) | Unlimited | 5000 |
| Exchange 2016 | 25 MB (default) | Unlimited | 5000 |
Note: Organization settings may further restrict these limits
Document Type Limitations
Supported vs Unsupported
Fully Supported
- ✅ Sales Quotes, Orders, Invoices
- ✅ Purchase Orders, Invoices
- ✅ Posted Documents
- ✅ Credit Memos
- ✅ Warehouse Shipments
Limited Support
- ⚠️ Service Documents: Basic template support
- ⚠️ Job Documents: Minimal personalization
- ⚠️ Assembly Orders: No specific templates
Not Supported
- ❌ Custom Report Objects: No EML generation
- ❌ Dataverse Integration: Only BC native
- ❌ External Documents: No third-party support
Template Limitations
HTML Template Issues
/* Problematic CSS */
.unsupported {
position: absolute; /* Not widely supported */
transform: rotate(); /* Email client issues */
/* @media queries — Limited support */
}Supported HTML Subset
- ✅ Basic HTML tags (p, div, table, br)
- ✅ CSS styling (inline preferred)
- ✅ Images (embedded or linked)
- ❌ JavaScript (security blocked)
- ❌ Complex CSS layouts (flexbox, grid)
- ❌ External font loading
User & Rights Limitations
Permission Dependencies
Minimum Required Rights
A user needs at minimum: - Document Read: For document access - Email Template Read: For template access - File Download: For EML files - Control Add-in Execute: For browser functionality
See also: Editing emails | Supported versions