"If one is not going to go the open source route" indicates that one has already chosen (for any number of relevant reasons) to stay away from any FOSS developed options so why would they be comparing Outlook and Evolution in the first place.

Thunderbird and Outlook both have win32 installs so if that was the comparison then his comment would have some relevance but that is not the case. In this case he's saying his usual "FOSS sucks" comment but basing it on the prechosen assumption that the client was not open to FOSS solutions in the first place which completely negates itself.

(good to see he's still alive and kicking though I can't say I've missed the random injections of unrelated negative opinion the last few months)