Selecting Mail Domain to send e-mail - Exchange 2010

We currently run Lotus Notes 6.5 and are looking to move to Exchange 2010 over the next few months.

Within the Company we run a single site AD domain (the domain meets the pre-requisites for Exchange 2010) – for example,

Under Notes we receive e-mail into the company from multiple namespaces – for example and Each user only has one mailbox and receives e-mail addressed to them (i.e. and from both domain namespaces.

At present, as some of our staff can perform tasks for both entities they can swap the sending e-mail address within Lotus Notes itself – via locations. So a user can send an e-mail from and then create enough e-mail, swap mail domain within Lotus Notes and then send enough e-mail from

Under Exchange 2010 I know you can receive e-mail inwards from multiple namespaces and configure the default mail address to use either the or namespace to send from but can a user select which e-mail namespace they are sending from under the client itself

FYI, we plan to use Outlook 2007 as the e-mail client.
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You can only have one address for the client to send from on a single account.

There are some ways around this using separate accounts for each address and then forwarding rules but they're probably not too practical in a large organization.

I'm happy to offer suggestions if you need.



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So, if you want to keep this functionality, and not burden your users with running multiple email clients, perhaps necessitating the use of virtual machines, I suggest you keep using the very efficient and cost effective lotrus Notes and Domino.
Actually it can be done quite simply from the users point of view but there is a significant added overhead to administration which may not make this suitable for more than about 5-10 users.

I still rate Microsoft Exchange and users seem to prefer Outlook to Notes in my experience, but I'm not getting into that debate. Just stating the facts in relation to the question.
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It's a fact Exchnage brings along a lot more administrative burden than Domino...
As I said. Not going there. Its not relevant to the question asked.
Yes it is.  Only this question should have been asked BEFORE the migration, to properly asses costs associated with migration.
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