Can Blackberry Enterprise Express be installed prior to Exchange 2010

I'm attempting to coordinate the upgrade to Exchange 2010 with BB Enterprise Express.  The Exchange upgrade is scheduled for 1/13/2011 but I'd like to get BB installed first.  Is this possible?
J.R. SitmanIT DirectorAsked:
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Shekhar2coolCommented:
If you have an existing messaging system like 2k3 or 2k7, then you definitely can do it.

After you upgrade to 2k10 you have to check the permissions for service account, and then move the users.

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J.R. SitmanIT DirectorAuthor Commented:
Move the users to BB?
Shekhar2coolCommented:
Nope Once you upgrade Mail environment, you will move users, right.
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J.R. SitmanIT DirectorAuthor Commented:
oh, yes we will.  After 2010 is running what change needs to be made to BB
J.R. SitmanIT DirectorAuthor Commented:
Thanks
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