Migration from Lotus to Office 365: not supported calendar message.ics

I am on a project to migrate from Lotus to Office 365. While using both system, some meetings from Lotus can’t be opened on Office 365 (OWA and Outlook 2010). Instead of meeting, we get a mail with two attached files:

Lotus allow to create meeting of a custom type. It allows to have recurring meeting, but without following any logics. We can then select abitrary dates:

Saving the ics file to disk and opening the file shows up the dates:

RDATE;VALUE=PERIOD:20111212T134500Z/20111212T144500Z
 ,20111214T134500Z/20111214T144500Z,20111229T134500Z/20111229T144500Z

Outlook doesn’t allows to create meeting like this, and so doesn’t open it.

I tried with GoogleApps, it opens it but does not respect the hours of meeting

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