Google Will Shut Down Picasa on May 1, 2016

Computer Help and Discussions Software
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http://news.softpedia.com/news/google-will-shut-down-picasa-on-may-1-2016-500354.shtml

Picasa users can migrate all their Picasa Web albums to Google Photos just by logging into the service at least one time. The Picasa Web albums service will be shut down on May 1, 2016, while development on the Picasa desktop application will stop on March 16, 2016.

Google blog announcement

http://googlephotos.blogspot.co.uk/2016/02/moving-on-from-picasa.html

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Not shutting, but shuttering.....

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This is from the article @hazelnut linked to.

I'm guessing it is the main reason.

The company now says that it does not make sense to allocate resources and human power to two different services that do the same thing, and it has decided to go with the newer, more apt service, as it would be logical to do.