Is there a limit to how many members there are in a distribution group when calling DistributionGroup BeginGetAllMembers and BeginExpand?

Question

I've recently tried using both the BeginGetAllMembers and BeginExpand methods of the DistributionGroup and they work fine when the distribution group had around 90 members.  However, they both fail when I try a group with over 200 members.  I get an error in the End methods for each coming from 'Microsoft.Lync.Model.Internal.CBWBase.BlockUntilDone()'.  I increased the MaxGroupSizeToExpand on the Lync server and that didn't help(http://social.technet.microsoft.com/Forums/en-US/ocsclients/thread/9c6fa06e-adfc-420a-a253-0c061dc16c83/).  I was wondering if the API has the same limitations as the server itself in that 150 is the limit for a group.  I've been trying to use these methods to get all users in our company at once.  Instead, as a temporary fix, I call the LyncClient.ContactManager.BeginSearch method for each letter in the alphabet to get them all.

Answer 1

There is not a specific limit in the size of DGs in the SDK, however the Lync Server defaults to a limit of 100 and you can increase DG max size up to 150 via group policy.

Read this Technet forum topic for more information: http://social.technet.microsoft.com/Forums/en-ZA/ocsaddressbook/thread/09a20c42-0e04-4f64-9aa7-dc3f1f4a1cd4

 

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