The following recurrence patterns are handled differently by Outlook and
Evolution and therefore cause interoperability problems:
1. Yearly on Feb 29
2. Monthly on day 29, 30 or 31

In those cases the day from the rule does not exist for every occurrence, Feb 29
for example only exists every 4 years. In such a case Outlook puts the
occurrence on the last day of the month, Evolution skips the occurrence
alltogether. This leads to the problem that such a rule defined in Outlook will
appear on a completely different list of days in Evolution, which is a big problem.

This can be easily reproduced with the Exchange connector.