Version:           3.5.9 (using 3.5.10, Debian Package 4:3.5.10.dfsg.1-0lenny1 (lenny/sid))
Compiler:          Target: i486-linux-gnu
OS:                Linux (i686) release 2.6.26-1-686

Unfortunately, this feature request is a bug also: The exceptions dialog of the recurrences dialog of the appointment dialog _does_ offer periods of time to be excepted from the recurrence:

Hitting the drop down arrow next to the exception date offers a calendar to select from, _and_ plaintext entries like
* next week
* next month.

However, they don't apply. So, to except a whole month, you may need to enter every individual date and add it to the exception list.

To improve usability, here, a bit, it would be nice if you could add some chance to select multiple days at once from the calendar, similarly to what you've given with in kOrganizers main window overview calendar.

Alternatively, some immediate input field where you could enter the exception period would be helpful too. Especially, if we could enter some wildcards there too, so that the exception got applied to, say, every year. Or every day with a leading 2 in it, or every month with a leading 1, etc.