did not make this guide im just quoting from another blog if you wish to post your thanks make sure you thank the person who made it over here: http://erroneus.tumblr.com/post/2765996497/dropbox-dropquest-2011-guide-free-space-for-dropbox

Here is the complete guide:

Go to https://www.dropbox.com/dropquest2011 to start which is important and further on to https://www.dropbox.com/dropquest2011/D
5305404/18681 = 284
Go to http://forums.dropbox.com/topic.php?id=284 , look at post 3 and download Step4.zip
In the zip it says 38.889, -94.703 – Those are coordinates and they mention a mascot. Google Maps: 38.889, -94.703. This School is close by and their mascot is huskies
Open Step5.zip which is inside Step4.zip with the pass “huskies”, go to http://www.dropbox.com/dropquest2011/r
Finish the puzzle (solution) and you are sent to https://www.dropbox.com/dropquest2011/0
The 3612th prime number is “33739”, it will send you to https://www.dropbox.com/dropquest2011/p
It refers to this picture at the Dropbox blog
Look at the picture, in the background is a yellow paper with an address to https://www.dropbox.com/dropquest2011/b
Solve the sudoku (you can use this solver or look at the solution), it leads you to: https://www.dropbox.com/dropquest2011/o

It wants you to go home, which means jump to the Dropbox homepage at https://www.dropbox.com
Go there and click the link at the top where it says it’s not over, it will lead you to https://www.dropbox.com/dropquest2011/x
The “book” is this forum thread
The post refers to this blog post
Click on Katana-ya at item 5 for your Step16.zip
In the zip file is a link to http://www.dropbox.com/dropquest2011/h and a image
The image from Step16.zip, it’s HEX color code is “BAFF1E”, enter it and you are taken to https://www.dropbox.com/dropquest2011/e
The names are anagrams for classic composers. The classic composer for Dropbox, is CEO “Drew Houston”, enter that and you are taken to https://www.dropbox.com/dropquest2011/a
The signs you see here are in braille and it says “help 206”, this is a hint for this page: http://www.dropbox.com/help/206
Download the Step21.zip
Place the picture from the zip in a dropbox folder and share it with dropquest@dropbox.com
Hint22.txt appears in the folder, which leads you to https://www.dropbox.com/votebox/3712/frozen-yogurt
This is a reference to Rian Hunter which can be found at https://www.dropbox.com/about
Click at Rian Hunter this leads you to https://www.dropbox.com/dropquest2011/R
The text is a reference to the game Chrono Trigger and the side quest Rainbow Shell, the link to the zip is therefore http://dl.dropbox.com/u/211024/rainbowshell.zip
In the zip you will find an address to http://www.dropbox.com/dropquest2011/t and a midi file
The key phrase is the notes from the midi file, which is: “badcabbage” and this leads you to https://www.dropbox.com/dropquest2011/s
Print out the paper, fold the paper to a crane and across it’s wings it says 11696 x 96911, which equels the the code “1133471056” on the wings. Enter the code and you are taken to https://www.dropbox.com/dropquest2011/U
Last puzzle! Remember those dropquest URL’s? The last letter, they form the the last code: “Dr0pbox heaRts U”
And you are done: https://www.dropbox.com/dropquest2011/finish_line
Check your score at https://www.dropbox.com/dropquest2011/wall_of_fame

Original Post http://erroneus.tumblr.com/post/2765996497/dropbox-dropquest-2011-guide-free-space-for-dropbox