In my opinion: no. If there is interference by microwave ovens: replace them, because they're broken! In my expirience a fully working microwave oven won't affect W-Lan (on 2.4 GHZ) at all:
I took 2 microwaves (700W each), put an iphone in between those two devices and started a speedtest (Speedflex-App). The AP had a wall in between.
Then I turned on both microwaves. There was no decreased thoughput. I tried this with channel 1, 6 and 11.
Keep in mind: those microwaves use a lot more transmitting energy (700W against 0,1W) so even if a extreme small ammount of the energy would be left out of the case (e.g. more than 0,1%) it would be more than an average AP and would fill out a channel.