Everything I have read is that the longer it is stored (properly) the less viable tomato pollen becomes. 6 months seems to still be an acceptable length of time for 60-80% effectiveness, quickly dropping to <50% at a year. At 2 years under proper storage, it was very hit/miss <10%.
Proper storage looks to be at 32F with low humidity. Let pollen dry out for a few days prior to storing. Desiccants can also help to keep moisture at bay. Short term storage <1 month, it was not recommended to refrigerate, just keep it in a cool dry place. Also I saw in several references was to use the smallest container possible so the pollen is stacked/layered and not spread out.
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