Exchange 2010 sp1 remote site unable to download OAB

I added our remote site as an accepted domain and configured their accounts to connect to our exchange server.  All worked perfect except I am unable to download the offline address book.  It never gets past the processing stage.

They reside on a different active directory domain.

Thank you
bidgadgetAsked:
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Seth SimmonsSr. Systems AdministratorCommented:
first thing i would do is get the exchange environment to a supported level - service pack 3 then to update rollup 9; might fix the issue
service pack 1 has been out of support since january 2013

Microsoft Exchange Server 2010 Service Pack 3 (SP3)
https://www.microsoft.com/en-us/download/details.aspx?id=36768

Update Rollup 9 For Exchange 2010 SP3
https://www.microsoft.com/en-us/download/details.aspx?id=46372
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AmitIT ArchitectCommented:
Any firewall or web proxy software, between two sites?
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bidgadgetAuthor Commented:
VPN between the two sites.  Also can't open shared calendars. I will try the upgrade next week like the earlier post but would like to get this working sooner

Thank you
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bidgadgetAuthor Commented:
When I excluded the outlook folder from the antivirus it then worked fine.  thank you
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