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Exchange Troubleshooting: The administrative limit for this request was exceeded When Enabling User

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Error: Unable to save Unified Messaging PIN for mailbox xxxx: The administrative limit for this request was exceeded.

http://lh6.ggpht.com/-CkkOfYQUwg8/UWY0yjGVTlI/AAAAAAAABic/v0KzRxnWIFQ/UM%252520Error%252520-%252520admin%252520exceeded%252520-%252520markup_thumb%25255B1%25255D.jpg?imgmax=800

After using my favorite search engine, I came up empty on this exact error message.  I did get a few hits on the generic “The administrative limit for this request was exceeded” message.

After a little research, signs were pointing me to the AD user account had a “runaway” attribute with too many entries in it causing other applications to fail when making changes to other attributes.  I reviewed one of the problem user’s attributes and found the userCertificate filled with a bunch of entries.

http://lh6.ggpht.com/-e3rIWYcykFE/UWY0032gPFI/AAAAAAAABis/Bud_-ljKrZI/UM%252520Error%252520-%252520admin%252520exceeded%252520-%252520ad%252520attr%252520-%252520markup_thumb%25255B1%25255D.jpg?imgmax=800

After clearing out the userCertificate attribute the mailbox was able to be UM enabled.