migration to google

Telus migrated my account 5 days ago. i have always used outlook for e-mails. This stopped working, i contacted telus and was told to change e-mail settings. This i did and my e-mails started working again on PC, ipad and iphone. Then suddenly Friday they stopped working again. I can access through gmail on the web but not trough my email accont on desktop of any device. Looking for help?