O3 spaces, Phpprojekt, Openexchange, Horde and accessibility

Hello to all,

I'm working on the development of a community platform with high concerns about usability and accessibility.

I am actually comparing and trying different systems like O3 spaces, Phpprojekt, Openexchange and Horde.

Do anyone of you have working/developer experience with these systems and could leave a feedback about accessibility and usability?

Thank you all,

Maria

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