Japanese title: いつの間に交換日記 ([i]Itsu no Ma ni Koukan Nikki[/i]) 
American title: Swapnote 
European title: Nintendo Letter Box

[[Nintendo]]'s [[nintendo_3ds|3DS]] written correspondence application. Features [[nikki_(swapnote)|Nikki]], a [[mii_(nintendo)|Mii]] guide to the app's message management functions.

The app's Internet functionality has been "suspended":http://www.nintendo.com/swapnote-notice.

h4. External links

* "Official Swapnote site":http://swapnote.nintendo.com/
* "Official Nintendo Letter Box site":http://www.nintendo.co.uk/NOE/en_GB/games/nintendo_3ds_download_software/nintendo_letter_box_47199.html 
* "Official いつの間に交換日記 site":http://www.nintendo.co.jp/3ds/eshop/jfrj/index.html 
* "Wikipedia(JP)":http://ja.wikipedia.org/wiki/%E3%81%84%E3%81%A4%E3%81%AE%E9%96%93%E3%81%AB%E4%BA%A4%E6%8F%9B%E6%97%A5%E8%A8%98
いつの間に交換日記