| Feature | 32-bit (x86) | 64-bit (x64) | | --- | --- | --- | | | Max 2GB per app | Can use more than 2GB RAM | | Compatibility | Works with all old add-ins (ActiveX, legacy VB) | Some add-ins may break | | Best for | General home/business use, heavy Excel with no huge datasets | Massive Excel files (>2GB), complex math models, Power Pivot | | Outlook | Works with any Exchange version | Requires Exchange 2010+ for MAPI | | Default recommendation | ✅ Microsoft recommends 32-bit for most users | Only if you need it for large data |
| Feature | 32-bit (x86) | 64-bit (x64) | | --- | --- | --- | | | Max 2GB per app | Can use more than 2GB RAM | | Compatibility | Works with all old add-ins (ActiveX, legacy VB) | Some add-ins may break | | Best for | General home/business use, heavy Excel with no huge datasets | Massive Excel files (>2GB), complex math models, Power Pivot | | Outlook | Works with any Exchange version | Requires Exchange 2010+ for MAPI | | Default recommendation | ✅ Microsoft recommends 32-bit for most users | Only if you need it for large data |