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For simplicity of manangement I would definatly use one forest. &nbsp;If you want to segregate them for administrative purposes you can setup a different domain in the same forest for each site. &nbsp;If your administrators maintain both sites then I would suggest just 1 domain in 1 forest.
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For simplicity of manangement I would definatly use one forest.  If you want to segregate them for administrative purposes you can setup a different domain in the same forest for each site.  If your administrators maintain both sites then I would suggest just 1 domain in 1 forest.

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We have a NY office .com and a London office .co.uk. The NY office is a single domain/forest configuration and so is the London domain. Both offices have their own Exchange servers.<br />
<br />
The UK office is planning to migrate their the mailboxes onto a new Exchange server on the NY .com domain. This server will be hosted in London.<br />
<br />
My question is do we go for a single forest or multiple forests with forest trusts between NY and UK. The users want one GAL and have the ability to connect to mailbox calendars from each site.<br />
<br />
Thanks in advance
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We have a NY office .com and a London office .co.uk. The NY office is a single domain/forest configuration and so is the London domain. Both offices have their own Exchange servers.

The UK office is planning to migrate their the mailboxes onto a new Exchange server on the NY .com domain. This server will be hosted in London.

My question is do we go for a single forest or multiple forests with forest trusts between NY and UK. The users want one GAL and have the ability to connect to mailbox calendars from each site.

Thanks in advance

Single forest or multiple forests

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

Windows Server 2003 was based on Windows XP and was released in four editions: Web, Standard, Enterprise and Datacenter. It also had derivative versions for clusters, storage and Microsoft’s Small Business Server. Important upgrades included integrating Internet Information Services (IIS), improvements to Active Directory (AD) and Group Policy (GP), and the migration to Automated System Recovery (ASR).