Just install a single virtual machine(<5minute) and then just change the MAC (- 5×1 + 1×31 = 36phut = 16GB dropbox! ^^
There are many ways to increase free space Dropbox sync as images from a memory card ( added 3GB), agree login account like fb … and invite others to join Dropbox (Maximum 16GB).
There have been many articles written instructions to get more free space from Dropbox, and I understand and consult on the definition of that article! including how to install virtual machines to invite other people to use and get extra space!(For each computer only for an account).
Also used his original virtual machine and follow the installation instructions, but every time a virtual machine is invite only and if there is a normal install winxp also take some time( Games 45p) So you find a way to install faster! and his following will guide you to do it this way! and if the guarantee was used in less than 5 minutes(If you are strong, you can more quickly) you can get an additional 500MB of dropbox and maximum 16GB / 1tk. 😉 (If your article content overlap with all of you, please do sympathize offline! because I just wanted to share for all to stop!)
His way still is to create virtual machines to invite others to join dropbox but I find this is the most effective way!( I did successfully 100%)^^ Account of his time was up 21,5GB rùi! ^^

First you need to download the tools to be used below:
+ Tool to create virtual machines Vitualbox: you can go to the vitualbox to down
+ The MicroXP 0.82.iso: medifire ( This is a shortened version should you install warehouse to fill what, just select the drive installed is OK, installation process will take less than 5p)
+ Software dropbox iso format : link mediafire (iso file to not have any more down the virtual machine) ^^
Steps: If you already know what steps they can skip that step.
Tie 1:
Login to your dropbox account for the link inviting others
-> get a mail order any ( as toxic as possible for clues coincide) to register dropbox
Step 2:
create virtual machines, install and use dropbox account registered to login => will get 500MB times 1. (attention: after a successful login, the virtual machine off immediately hit ko “Next” another)
Step 3:
Change the virtual machine's MAC:in the virtual machine's network settings refesh the MAC is xong-> boot ^> login ->^^ Eat 500MB of it in less than 1 ^^ minutes (Thanks physician haduytintyt235) and repeat as! ^^

The doctor has experience in machinery is sure there is no need to read any, if you are interested in Dropbox, then follow the steps below nhé! Goodlucky!

source, see more at Tiee: http://www.tinhte.vn/threads/hd-dropbox-update-nhanh-hon-cach-lay-tron-16gb-mien-phi-cua-dropbox-dam-bao-thanh-cong-100.1229572/