Google announced that from March 16, 2016 will no longer support the photo management tool Picasa, encourage users to use the company's new photo application "Google Photos" (Google Photos). Picasa advantage is that no matter how many photos, how much space will be needed to find the picture a few seconds, Google Photos and Picasa biggest difference is its powerful machine learning capabilities, Google Photos can be automatically identified by the technology and to the picture tagging. Google Photos name has pure blood, its unlimited photo and video storage characteristics as well as photo identification, owns and maintains two sets of similar services is obviously not a good choice, so Google has no reason to maintain the existence of Picasa. 
Picasa close prologue will be held on March 15 opened, and from that day, Google will not launch any app for the desktop version updates. It can still be used, but there is no formal follow-up support. Developers will lose access to certain features Picasa API, Flash support, community search, in addition to the upload operation, as well as support for tags, comments, and contacts. We do not need hands to migrate content from Picasa to Google Photos, the former contents of all albums can be viewed directly on the new service, edit, share.
This switched: https://www.linuxprobe.com/google-closed-picasa-google-photos-for-dawn.html