They say it has left them unable to access bank accounts and job offers - and stopped them using Skype, which Microsoft owns, to contact relatives in war-torn Gaza.
Microsoft says they violated its terms of service - a claim they dispute.
“They killed my life online,” said Eiad Hametto, who lives in Saudi Arabia.
“They’ve suspended my email account that I’ve had for nearly 20 years - It was connected to all my work,” he told the BBC.
He also said being cut off from Skype was a huge blow for his family.
The internet is frequently disrupted or switched off there because of the Israeli military campaign - and standard international calls are very expensive.
Israel launched its offensive in Gaza in response to the Hamas attack on 7 October, which killed about 1,200 people. The Hamas-run health ministry in Gaza says more than 38,000 people have been killed in the war.
For sure good advice. I do trust the registrar I am on though. They are not US based, I have been with them for like 15 years, they are well known, automatically provide domain privacy without paying extra, and are not godaddy.
No matter who people choose, just remember to keep your domain locked when not changing registrars, and protect your registrar login with 2FA. Treat your registrar like you would treat your primary email or bank account.