Employee Count and Licensing Usage: - What is your employee count? - Do you use Microsoft E3, E5, or a variation (e.g., E3 + Security E5)? - Do you rely only on Microsoft EOP and/or Defender for O365 for email protection? If not, what other product(s) do you use (e.g., Proofpoint, Abnormal)?

Around 16K employees
ProofPoint -> Defender (E5) -> Abnormal -> Security Awareness training for employees
It usually surprises me what gets through and stopped by Abnormal.

We have various employees and license type due to the type of our business. We are a US based retail company with thousands of store employees, store managers and headquarters employees. For our HQ population we use E5 License, and we utilize Microsoft Defender for Office 365 protection. After spending time getting it configured correctly it does an adequate job protecting the company. Reach out if I can help with any additional questions.

We have about 2200 employees and about 800 contractors, so ~3,000 workers worldwide. We have E1 licenses for contractors that we don't give laptops to and all other workers, which is the vast majority, have E3 licenses. We have bought <10 E5 licenses for some of our O365 administrators since it gives them the ability to leverage some additional security tools. 

On the security side, we mostly don't love Microsoft's security approach or track record. We use SentinelOne as our EDR/antivirus and we use Proofpoint as our email gateway (and are happy with both).

Good luck!

~1500 O365 E1 + Defender for O365 frontline workers and consultants/contractors
~7500 M365 E3 + E5 Security general staff with assigned tech
~20 M365 E5

Full security stack is Microsoft dependent (O365, endpoint, cloud, sentinel)

More than 1500 E5.
Defender for clients yes.
Mail Symantec-> Fireeye-> Defender ....