With a title like that, you just know this is going to be fun. (No, seriously.)

The user agent string is one of those wonderfully eclectic things, a balance of modernity and antiquity. Except mostly skewed toward antiquity. It’s grown, piece by piece, over the years; because everyone has their own special way of parsing it, it’s a notoriously sensitive beast. Adding to it is relatively simple, but removing or rearranging bits is not.

If you’re a web developer and you rely on bits in the UA string, this post is definitely for you. As it so happens, the UA string for Internet Explorer 9 has undergone some revision, and Microsoft has recently announced the string for IE Mobile. This makes the time ripe for a revision so that web developers can make the necessary changes to sniffer code all at once.