Yes you can access Google Email (Gmail) from Outlook

Access your Google Mail from Outlook.

Not only Outlook but:

• BlackBerry Internet Service ™
• Entourage 2004
• Foxmail 5.0
• Eudora 5.1 (Sponsored & Paid Modes)
• Netscape 7
• The Bat! v3.62 Professional Edition
• Entourage X
• Eudora 5.1 (Light Mode)
• SnapperMail
• Thunderbird 0.x
• Mozilla 1.7

Basically anything that supports a POP mail server.