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A little bit more information. The problem seems to arise when you go to file | open other users mailbox. You receive the error message below. <br />
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If you go and make a new outlook profile and specify the other exchange server and username you can open their mailbox without a problem.<br />
<a href="https://filedb.experts-exchange.com/incoming/2010/01_w02/219677/1.jpg" target="_blank" class="file-inline" title="error (36 KB)"><svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 512 512"><path d="M67.508 468.467c-58.005-58.013-58.016-151.92 0-209.943l225.011-225.04c44.643-44.645 117.279-44.645 161.92 0 44.743 44.749 44.753 117.186 0 161.944l-189.465 189.49c-31.41 31.413-82.518 31.412-113.926.001-31.479-31.482-31.49-82.453 0-113.944L311.51 110.491c4.687-4.687 12.286-4.687 16.972 0l16.967 16.971c4.685 4.686 4.685 12.283 0 16.969L184.983 304.917c-12.724 12.724-12.73 33.328 0 46.058 12.696 12.697 33.356 12.699 46.054-.001l189.465-189.489c25.987-25.989 25.994-68.06.001-94.056-25.931-25.934-68.119-25.932-94.049 0l-225.01 225.039c-39.249 39.252-39.258 102.795-.001 142.057 39.285 39.29 102.885 39.287 142.162-.028A739446.174 739446.174 0 0 1 439.497 238.49c4.686-4.687 12.282-4.684 16.969.004l16.967 16.971c4.685 4.686 4.689 12.279.004 16.965a755654.128 755654.128 0 0 0-195.881 195.996c-58.034 58.092-152.004 58.093-210.048.041z"/></svg>1.jpg</a>
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A little bit more information. The problem seems to arise when you go to file | open other users mailbox. You receive the error message below.

If you go and make a new outlook profile and specify the other exchange server and username you can open their mailbox without a problem.
1.jpg [https://filedb.experts-exchange.com/incoming/2010/01_w02/219677/1.jpg]

1.jpg

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Instead of opening it under File-&gt;Open you choose Tools-&gt;Email accounts, double-click the Exchange account, select the Advanced tab and enter the mailbox there.
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Instead of opening it under File->Open you choose Tools->Email accounts, double-click the Exchange account, select the Advanced tab and enter the mailbox there.

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We recently acquired another company and have since created a domain trust between the two. Servers in each company can be reached from both ends and permissions etc can be granted to users in both domains. <br />
<br />
Today we had a request for an admin assistant at company A to be given access to a mailbox in company B. In the same domain/exchange organization this isnt an issue its as simple as setting up a delegation for them. <br />
<br />
I am trying to do this for the user in the other domain but I can not add this in. Is it possible to open a mailbox on another domain/exchange org in outlook 2007? I have given the user full mailbox access. 
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We recently acquired another company and have since created a domain trust between the two. Servers in each company can be reached from both ends and permissions etc can be granted to users in both domains. 

Today we had a request for an admin assistant at company A to be given access to a mailbox in company B. In the same domain/exchange organization this isnt an issue its as simple as setting up a delegation for them. 

I am trying to do this for the user in the other domain but I can not add this in. Is it possible to open a mailbox on another domain/exchange org in outlook 2007? I have given the user full mailbox access. 

Outlook 2007 connect to a mailbox on another domain\exchange server

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

Active Directory (AD) is a Microsoft brand for identity-related capabilities. In the on-premises world, Windows Server AD provides a set of identity capabilities and services, and is hugely popular (88% of Fortune 1000 and 95% of enterprises use AD). This topic includes all things Active Directory including DNS, Group Policy, DFS, troubleshooting, ADFS, and all other topics under the Microsoft AD and identity umbrella.

Active Directory

Microsoft Outlook is a personal information manager from Microsoft, available as a part of the Microsoft Office suite. Although often used mainly as an email application, it also includes a calendar, task manager, contact manager, note-taker, journal, and web browser.