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3 companys on same exchange server..

cybergenie
cybergenie used Ask the Experts™
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We run an Exchange server for 3 companies (including us).
When I want to delege/assign tasks to a specifik person I can also see the other users in it.
Is there a way that the 3 firms can only see the users withing it's own firm in "assign" and in "from" when sending an email?

Thanks
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It might not hurt for you to look at the hosted Exchange services documents.  Dividing users and contacts into their OUs, building custom GALs and OABs, and configuring permissions in AD is a bit time consuming, but it is worth it.

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Commented:
Forgot to say that the server is a smallbusiness server...

I am not an expert in neither Windows Server 2003 or Exchange. But is this possible when using SBS ?.

"It might not hurt for you to look at the hosted Exchange services documents.  Dividing users and contacts into their OUs, building custom GALs and OABs, and configuring permissions in AD is a bit time consuming, but it is worth it."
SBS is a little bit different of a ballgame.  You can do things similar to Hosted Exchange, but you can't actually do the hosted Exchange on Small Business Server.  SBS utilizes a lot of wizards in order to accomplish tasks.

Can you create OUs in AD Users & Computers, yes.
Can you build a custom GAL and OAB, yes.
Can you configure permissions in AD, yes.

My suggestion would be to gain familiarity with Windows Server 2003 and Exchange Server 2003, experimenting in a lab environment.  If you don't know what an ancronym means, then ask and then hit a Live.com search and read the articles to learn.  If a mistake is made it could really make your life bad and could cause a degredation in work.  Obviously, it is always a good idea to have a backup of the server, its data, Exchange, and Active Directory.

...and it never hurts to work with folks who are experts in a product and can cross-train you.  You find a lot of these folks at the local Microsoft Certified training centers.  Sometimes you find them in a club, which is generally hosted at the training center.

You can install Virtual PC at home and run a virtual lab, provided you have the RAM to do so.

The linkage from MSExchange.org provides some good guidance regarding what you should test in your lab before you make changes in production.