Please read the following table in Markdown format and then answer the question according to the table. Table cells in one row are seperated by '|', and different rows are seperated by '
'.

Table:
| Title | Developer | Category | Function | Release date | Version |
| --- | --- | --- | --- | --- | --- |
| Calendar | Matchbox | Utilities | Virtual calendar and scheduler. | 2011-07-29 | 1.0.0.3 |
| Chord Finder | Microsoft | Utilities | Virtual guitar used to find s power chord . | 2010-11-17 | 1.0 |
| Drum Machine HD | Dino Games | Utilities | Virtual drum kit . | 2010-10-20 | 1.0 |
| Facebook | Matchbox | Social Networking | Facebook application. | 2010-12-16 | 1.4 |
| Metronome | Dino Games | Utilities | Virtual metronome. | 2010-09-09 | 1.0 |
| Notes | Microsoft | Utilities | Virtual notepad. | 2011-06-23 | 1.0 |
| Piano | Microsoft | Entertainment | Virtual musical keyboard . | 2009-11-01 | 1.0 |
| Twitter | Matchbox | Social Networking | Twitter application. | 2010-12-16 | 1.6 |
| Windows Live Messenger | Microsoft | Social Networking | Messenger application. | 2010-11-17 | 1.4 |
Question:
What functions were released on 2011-06-23? 
Answer:
Virtual notepad.