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Cross Forest Email Integration (GAL, shared calendar, email account)

Right now there are two forests, both with Exchange 2003 and connected by VPN:


We're using Quest to maintain GAL sync across both forests, but due to costs, it will be abandoned (unfortunately). There is a two way trust between the forests.

We're trying to come up with a solution that will solve the following:

1. Give users of the CANADA.COM domain USA.COM email addresses. Right now CANADA.COM users are given accounts on the USA.COM domain for this purpose, and it just isn't right!

2. Several USA.COM users need to view shared calendars in CANADA.COM. Right now, a temporary "shared" user account is created in CANADA.COM for USA.COM folks to log into and view calendars. This definitely isn't right.

3. GAL sync has been spotty at best using Quest and this may be one of the other reasons it is being tossed out. There needs to be some sort of GAL sync between the two organizations.

4. CANADA.COM is trying to allow it's users to manage it's own distribution lists. For example, managers may be able to add/remove users from their own respective distribution lists. How might this be accomplished?

Upgrading to Exchange 2007 is certainly an option if it would mean any of the above can be simplified! Thanks folks!
2 Solutions
Steven WellsCommented:
It may be possible to use a product like microsoft identity manager, but it may be better to look at colapsing your domains into one domain to allow for one global exchange environment.
SpottedBunnyAuthor Commented:
Collapsing is an option as USA.COM wishes to assimilate CANADA.COM for a fee, but the fee is steep enough that the stakeholders won't go for it. Sounds like real life, doesn't it? :) As for MIIP, I've only heard it in passing, but am unsure how (or if) it can fit for the criteria we have above...
Thanks for checking in though!

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