There are Betas and then there are Betas. Usually, a Beta version is published so that many average users can test it; the version may therefore contain bugs, some modules or some functions may not work, and there may be problems with its ability to interface with other applications.
For example, Microsoft Betas are usually buggy while Google Betas have already gone through some user testing before release,so they work reasonably well, but await additional functionality in the future. If you can determine the source of the application or the application name, some Internet research should provide information and comments about the Beta version's quality. I would suspect that since Yahoo is involved, the Beta application would be as good as are Google's (but read any disclaimer before downloading or using it).
No Beta application should be relied upon for any "mission critical" purpose, and, unless you are faily computer savvy and able to troubleshoot minor- - -sometimes major- - -problems (after all, you are testing something), the best choice is to avoid them, and await a final version.
Edited by jgweed, 26 May 2006 - 03:00 PM.