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Previously while
accessing Zoho services, users had the liberty of accessing all the
Zoho Apps (except Zoho CRM) with a single User name and password. With this release, Zoho
CRM becomes a part of Zoho SSO. This means users once created within
the Zoho CRM need not create a different account (User name and
password) for accessing other Zoho services and vice versa.
To know more on this refer : SSO Transition Guide
Victor