Free busy share cross forest

Dear members,

Current working on cross forest migration between Exchange 2010 and Exchange 2013 I need to share between both Exchange free busy and calendar.

Since Federation is not available (must share smtp domain during migration), I try to share free busy using availability address space.
On source.local and destination.local I run:
add-adpermission -accessrights extendedright -extendendright "ms-Exch-EPI-token-serialization" -user "destination.local- source.local\exchange servers"
Then, add-availabilityaddressspace -forestname  destination.local-source.local -accessmethod peruserFB -useseviceaccount:$true
Last, export-autodiscoverconfig -targetforestdomaincontroller dc.destination.local-dc.source.local -targetforestcredential $target -multipleexchangedeployments $true.

Now, I can access to free busy and calendar from source to destination. I can add meetings from source to destination, but from destination to source is not possible (can not access to server).

I have some kind of galsync between forest (exports all source mailbox as contacts on destination using script, but I do some test creating MEU using prepare-moverequest), checked autodiscover on source and destination and seems to be correct.

Try to increase logging but can not find anything on event viewer.

Appreciate any help.
LVL 19
Miguel Angel Perez MuñozAsked:
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Scott CSenior EngineerCommented:
See this blog about Cross Forest Free/Busy .

http://blogs.technet.com/b/msukucc/archive/2013/11/27/cross-forest-free-busy-in-untrusted-forests.aspx

Make sure you've covered the 9 steps listed.
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Miguel Angel Perez MuñozAuthor Commented:
Dear ScottCha, I´m afraid this is not my case. I have trusts between forest and autodiscover was exported.

Thanks.
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Miguel Angel Perez MuñozAuthor Commented:
I found where problem was, must to give permissions "ms-Exch-EPI-token-serialization" on Exchange 2010 CAS servers and Exchange 2013 Mailbox servers.
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Miguel Angel Perez MuñozAuthor Commented:
Any comments fits on my case. Finally found after 4 days of research.
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