| Add Email Reminders (Including Custom) |
❌ |
✅ |
✅ |
Can be added to events created in Classic using New or Web. |
| Duplicate Events |
❌ |
✅ |
✅ |
Events created in Classic can be duplicated using New or Web. The duplicated meeting will keep the original meeting's chat history. |
| .ics Files |
✅ |
⚠️ (won't open when double-clicked, must import) |
⚠️ (must import) |
|
|
Offline use
|
✅
|
⚠️ (partial; improving)
|
❌
|
If you travel/work with spotty internet, Classic is safest.
|
|
PST files (.pst)
|
✅
|
⚠️ (partial)
|
❌
|
If you rely on PST archives, Classic is more complete.
|
|
Mail merge
|
✅
|
⚠️ / No (varies by note)
|
⚠️
|
Traditional Word/Excel mail merge works best in Classic.
|
|
Quick Parts
|
✅
|
🕒 (coming soon)
|
—
|
Use Classic until New catches up.
|
|
COM add-ins / VBA
|
✅
|
❌
|
❌
|
If you depend on legacy add-ins, stay on Classic.
|
|
Web add-ins (Office Add-ins)
|
✅
|
✅
|
✅
|
Modern add-ins are supported across experiences.
|
|
Multiple profiles
|
✅
|
🕒
|
❌
|
If you switch between separate Outlook profiles, use Classic.
|
|
Shared mailbox (folders)
|
✅
|
✅
|
✅
|
Works across endpoints.
|
|
Shared mailbox as account (manage rules/categories/OOO)
|
✅
|
✅ (rollout-dependent)
|
—
|
Supported in New, availability can vary.
controls improving but inconsistent across tenants
|
|
Rules (complex)
|
✅
|
⚠️ (partial)
|
⚠️
|
Classic tends to offer more for complex rules.
|
|
Folder colors
|
❌
|
✅ (does not sync to Web)
|
✅ (does not sync to New)
|
New/OWA advantage; note one‑way/unsynced behaviors.
|
|
Pin messages
|
❌
|
✅
|
✅
|
New/OWA support pinning.
|
|
.EML / .MSG / .OFT handling
|
✅
|
✅ for .eml; ⚠️ for .msg/.oft
|
❌
|
If you regularly handle .msg files, Classic is more reliable.
|
|
Notes module
|
✅
|
⚠️ (partial)
|
❌
|
If you use Outlook Notes, Classic is safer.
|
|
Distribution lists / groups (UX)
|
✅
|
🔁 Revised experience
|
🔁
|
Experience differs in New; often managed via portal on Web.
|
|
Contact lists (basic)
|
✅
|
✅
|
✅
|
Basic contact lists work across endpoints.
|
|
Share a Contacts folder
|
🕒/⚠️ (investigating)
|
🕒/⚠️ (investigating)
|
🕒/⚠️ (investigating)
|
Microsoft lists as "Investigating".
|
|
Copilot features in Outlook
|
✅
|
✅
|
✅
|
Available where licensed.
|
|
Drag calendar item to other calendar
|
✅
|
❌
|
❌
|
Classic only per internal notes.
|
|
Drag email to desktop / Save message file
|
✅(MSG drag‑drop)
|
File > Save As (EML)
|
—
|
Different file handling between Classic and New.
|
|
"File" menu in Calendar
|
✅
|
❌
|
✅
|
Classic and Web have a Calendar File menu; New does not.
|
|
Forward from Group mailbox
|
✅
|
❌(item type invalid)
|
—
|
Forwarding from Group mailbox not available in New (per notes).
|
|
Roaming Signatures
|
❌
|
✅
|
—
|
Roaming signatures supported in New.
|
| HTML/CSS Rendering |
❌ |
✅ |
✅ |
If email messages don't appear correctly, use Outlook New or Web. |
| External content / “Show blocked content” (images) |
✅ (global Trust Center control + per‑message download) |
❌ (no equivalent global control; Safe Senders / per‑message only) |
⚠️ (per‑message + Safe Senders only) |
Classic allows global enable/disable of blocked content behavior; New/OWA require per-message or Safe Sender trust |
| Trust Center / advanced client security controls |
✅ |
❌ |
na |
Trust Center model largely absent in New; controls simplified or removed |