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You may try to use EAC to assign the permission but i not sure it allow you to select the account forest or not. <br />
<br />
Refer to below link.<br />
<a href="http://technet.microsoft.com/en-us/library/jj919240%28v=exchg.150%29.aspx" rel="ugc nofollow">http://technet.microsoft.com/en-us/library/jj919240%28v=exchg.150%29.aspx</a>
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You may try to use EAC to assign the permission but i not sure it allow you to select the account forest or not.

Refer to below link.
http://technet.microsoft.com/en-us/library/jj919240%28v=exchg.150%29.aspx [http://technet.microsoft.com/en-us/library/jj919240%28v=exchg.150%29.aspx]

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Hello,<br />
<br />
Assign the permission to the account in the Resource forest. The account in the Account forest will have permissions through the Exchange Master Account SID attribute.<br />
<br />
-JJ
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Hello,

Assign the permission to the account in the Resource forest. The account in the Account forest will have permissions through the Exchange Master Account SID attribute.

-JJ

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Hello All, <br />
<br />
We have exchange 2013 in resourse forest topology. i have some distrubution groups. I need to give manage By permission for the some users. <br />
<br />
So i need to give this permission to the users in Account forest. how can i give this ? When i ran the EMS its saying its cannot find the user in the resource forest. <br />
<br />
regards
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Hello All, 

We have exchange 2013 in resourse forest topology. i have some distrubution groups. I need to give manage By permission for the some users. 

So i need to give this permission to the users in Account forest. how can i give this ? When i ran the EMS its saying its cannot find the user in the resource forest. 

regards

Give permission in Exchange 2013 Resource Forest

Exchange is the server side of a collaborative application product that is part of the Microsoft Server infrastructure. Exchange's major features include email, calendaring, contacts and tasks, support for mobile and web-based access to information, and support for data storage.

Exchange

Within Internet message handling services (MHS), a message transfer agent or mail transfer agent (MTA) or mail relay is software that transfers electronic mail messages from one computer to another using a client–server application architecture. A MTA implements both the client (sending) and server (receiving) portions of the Simple Mail Transfer Protocol (SMTP). The terms mail server, mail exchanger, and MX host may also refer to a computer performing the MTA function. The Domain Name System (DNS) associates a mail server to a domain with mail exchanger (MX) resource records containing the domain name of a host providing MTA services.

Email Servers

Microsoft applications include a variety of software programs, including development and digital authoring programs (Expression and Media Center), educational programs, Internet software, including Essentials, Skype and the Live family, anti-virus, productivity applications and suites like Office, Excel, Word, Outlook, Access and PowerPoint, video games and server applications such as Exchange, SharePoint, IIS and Virtual Server.