Sister website of Zoho should use Zoho Single Signon as well ...
Zoho Team,
I believe Toondoo is owned by ZohoCorp. And I observe that Toondoo uses its own proprietary registration and authentication. You have the most powerful Single Signon vested with Zoho and I just thought Toondoo should be a forerunner to the world in demonstrating the capability in using the same.
We have a saying in Tamil "கையில் வெண்ணையை வைத்துக் கொண்டு நெய்க்கு அலைவது போல". Going for an isolated authentication when you have something worldclass sounds a bit comedy (or a tragedy to tell the truth).
I have also written this note to Toondoo team to initiate a brainstorming of bringing their authentication into Zoho SSO fold.
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Deepak Vasudevan
http://thamizhththendral.blogspot.com/