1- Most companies in Qatar works on projects , specially in construction because of unprecedented construction boom . They add or reduce staff depends on projects . Buying perpetual licenses will be very costly for them compared to buying 2-3 years exchange online or Microsoft 365 or cloud .

2-  Expensive static IP addresses – Public IP is very very expensive in Qatar compared to other countries . Hosting email servers need Public IPs , the monthly recurring amount for in-house hosted servers is many fold higher compared to exchange only

3-Spam attacks and protections – Many hackers and spammers attempting to attack Qatar servers because of its wealthy-country image outside . It will be a huge investment for companies to safe-guard its servers .

4- Trained staff – Difficult and costly for companies to get trained staff to manage/backup/protects servers and firewall

5- Delivery time – Servers , Firewalls etc are not generally stocked in Qatar . Because of it launching IT projects takes time. Cloud based solutions launch immediately .

You can buy Microsoft Exchange online solutions on https://www.tekstore.qa/product-p/q6y-00003.htm