| Email Service | Storage Capacity | Spam Filtering | Integration | Interface | | --- | --- | --- | --- | --- | | Gmail | 15 GB | Advanced | Google services | Simple | | Yahoo | 1 TB | Weaker | Limited | Cluttered | | Hotmail (Outlook) | 5 GB | Improved | Microsoft services | Cluttered (improved) | | AOL | 500 MB | Weaker | Limited | Simple |