You can get updated OS of blackberry from its official site below.
Download Blackberry OS 6.0

This update is best suited for personal email users. To determine what
type of email you use with your BlackBerry, read the explanations of
personal and corporate email below:

Personal email accounts:
Personal email refers to any POP3/IMAP webmail service that can be
accessed via a web browser. Examples of personal email accounts include
GMAIL, Hotmail, Yahoo, AOL, etc.

Corporate email accounts:
Corporate email accounts are assigned to individuals by their employer;
a corporate email addreess typically begins with a user name and ends
with the company's name. Corporate email accounts can be accessed via
Microsoft Outlook, Outlook Express, etc. For corporate email to be
supported on your BlackBerry device, your company's IT department must
have a BlackBerry Enterprise Server (check with your company's IT
department to verify that it has a BlackBerry Enterprise Server).

BlackBerry 2011