 |
 |  | 80 | Psion Software is founded
|
| | Sep 89 | EPOC/16 (SIBO) is released |
| | Sep 91 | SIBO on Psion Series 3 is released |
| | 93 | SIBO on Psion Series 3a is released |
| | 96 | SIBO on Psion Series 3c is released |
| | | SIBO on Psion Siena is released
|
| | 97 | EPOC R1-R3 is released |
| | Jul 97 | EPOC R1 on Psion Series 5 is released
|
| | 98 | Psion, Ericsson, Nokia and Motorola form Symbian
|
| | | EPOC R4 is released |
| | | SIBO on Psion Series 3mx is released
|
| | 99 | EPOC R5 is released (incl. EPOC R5 on Psion Series 5mx, EPOC R5 on Psion Revo and EPOC R5 on Psion Series 7) |
| | Oct 99 | EPOC R4 on Oregon Osaris is released
|
| | 00 | A first mobile phone using Symbian OS is released (Ericsson R380)
|
| | Sep 00 | Symbian OS 6.0 is released
|
| | Apr 03 | Symbian OS 7.0 is released
|
| | 04 | Psion sells its share of ownership over Symbian and leaves the alliance
|
| | Feb 04 | Symbian OS 8.0 is released
|
| | 06 | Symbian OS 9.0 is to be released |
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