I've notice some folks having to reinstall TS3 for various reasons, and thought I'd share what I know about getting your new TS install back to what you had before.
Export your TS3 Identity by going to Setting - Identities, and click Export at top-right. This is also where you Import it later on.
Bookmarks, Hotkeys, and Contacts are all contained in C:\Users\[username]\AppData\Roaming\TS3Client\
settings.db
Security settings are in the C:\Users\[username]\AppData\Roaming\TS3Client\
ts3clientui_qt.secrets.conf (this contains saved passwords and higher TS3 privileges).
If you wish to reinstall because of some unresolved issue, be sure to delete C:\Users\[username]\AppData\Roaming\TS3Client\ . This folder is left over after an uninstall, and those remaining files are often the cause of many issues.
The overlay that
I prefer can be grabbed from here:
http://www.mediafire.com/download/75yjh6iid7kt022/ts3_overlay-v3.7.23.ts3_plugin
Update: you can find previous TS3 versions here:
http://ftp.4players.de/pub/hosted/ts3/releases/
Always makes me laugh ts3clientui_qt.secrets.conf shhhh don't tell ..
I created a folder to export to but nothing happens. What i do wrong Abram?