X0306 4 2017-03-10 0001170534 MITEL NETWORKS CORP MITL 0001273417 WILLIAMS DAVID M 350 LEGGET DRIVE OTTAWA, ON K2K 2W7 A6 1 Common Shares 2017-03-10 4 P 0 15000 6.90 A 210000 D Common Shares 2300 I June William (Spouse) 15,000 shares purchased on March 10, 2017 were purchased at Cdn$9.30 converted to US$6.90 using the noon exchange rate of The Bank of Canada. 2,300 Common Shares were purchased March 3, 2017 by Mr. William's wife, June Williams. Mr. Williams disclaims beneficial ownership of the Common Shares held by his wife and this report shall not be deemed an admission that Mr. Williams is a beneficial owner of such for purposes of Section 16 of the Securities Exchange Act of 1934, as amended (the "Exchange Act"), or for any other purpose. /s/ David M. Williams 2017-03-10