Yammer Reviews

Teambox is not a alternative to yammer

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Yammer is a private social network, while Teambox is an app to manage projects, at least is what they argue. I have used both for years in my company and I cant see any similarity

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For sure, Yammer is not design to manage projects, all the same can be usefull for, but extensions (paid) add project management features.

Also very nice for external collaboration

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The description is not talking about the feature to create external "networks", where you can invite external none corporate email so you can engage collaboration, partners, sub-contractors, or customers. We do that.
Except the ergonomic is not perfect, because some button/menu not well expected position (like external networks on lower left, below the list of groups...)
The "unpaid" version is not limited in size, but you can't use the advanced management tools.
The paid version do not ask for money your external users, are total free.

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Yammer integrate the capabilities to create 'external' groups, so you can invite people outside your organization, inside... Not sure a good idea, hope able to deactivate this option !