A few days ago Josep sent me a link to a great knowledgebase article that details the differences between BES and BIS. This is a quick fact sheet and does not get down into the gritty details but it is a great resource for explaining the difference to new users.
Check it out at this link or a copy after the jump
|Feature||BlackBerry Internet Service 2.0 through 2.5||BlackBerry Enterprise Server software versions 4.0 through 4.1|
|Wireless calendar synchronization||No||Yes|
|Computer must be running at all times||No||No|
|Computer must have a continuous connection to the Internet||No||No|
|Desktop email application support||
|Security||Email messages sent between the BlackBerry Internet Service and the BlackBerry Internet Service subscriber’s BlackBerry smartphone are not encrypted. When transmitted over the wireless network, the email messages are subject to the existing or available network security model(s).
When you log in to the BlackBerry Internet Service, the data is transmitted over a Secure Sockets Layer (SSL) connection.
|Email messages sent between the BlackBerry smartphone and the BlackBerry Enterprise Server are encrypted using Triple Data Encryption Standard (Triple DES), Advanced Encryption Standard (AES), or both.
Important: BlackBerry Enterprise Server software versions for Novell GroupWise support AES encryption only.
|Access multiple external email mailboxes||Yes||Only when supported by your wireless service provider.|
|Email message attachment support||Yes||Yes|