Exchange 2013, need to add an admin to exchange but currently there is no admin

I have an exchange server in a closed area that is only used to receive log files.  The previous employee who set it up is no longer at the company, and we just realized there is noone with administrator rights in exchange.  I changed the previous users password and logged into ECP with his credentials, but even his account isn't set as admin.

Is there any way to set a user as admin from power shell, or some other way?
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Sys_Admin1Asked:
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Scott CSenior EngineerCommented:
Try logging into the ECP with an account with Domain/Enterprise Admin rights.

That should let you in.

Once in, then you can use the EAC following the steps in the following....http://www.techieshelp.com/add-an-administrator-to-exchange-2013/

Here's a blog on adding permission using Exchange PowerShell.

https://blog.netwrix.com/2014/07/03/powershell-for-rbac-in-exchange-2013/
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Adam BrownSr Solutions ArchitectCommented:
You need to add any administrators to the Organization Management group in AD to give them full Exchange administrative access. Org Management is one of about 10 security groups in the Microsoft Exchange Security Groups OU on your domain. Those groups have the default rights assigned to administrators for Exchange. Scott's links will work, but they're basically the hard way of doing it. The default groups already have the correct roles assigned for management. RBAC is only necessary if you have specific security policy requirements that demand limited administrative access.
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Todd NelsonSystems EngineerCommented:
I echo what Adam states.  The easiest way to accomplish what you are asking is in ADUC, add a user as a member of the Organization Management AD group.
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Sys_Admin1Author Commented:
Thank you all for the information.  Unfortunately I am now unable to to open ecp at all, and often can't even RDP into the exchange server.  It's a VM so I can log in from the hyper-v management console and all the exchange services are running, but the event log is showing random system reboots and restarting of some exchange services.  It seems the server has problems unrelated to my attempts to set an admin... the whole reason for even noticing this was that we were having other problems so I wanted to get into ecp and look at the settings.
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